2026-07-29 15:40:40 +00:00
198 changed files with 16907 additions and 15195 deletions
@@ -2,8 +2,12 @@
 # Development quality enforcement aliases
 check-all = "clippy --all-targets --workspace -- -D warnings"
 test-all = "test --workspace"
-cov = "llvm-cov --workspace --fail-under-lines 100"
+cov = "llvm-cov --workspace --ignore-filename-regex main\\.rs --summary-only"
 verify = ["fmt --all -- --check", "check-all", "test-all"]
+# Dogfooding: build the runnable daemon + reference CLI in release mode.
+build-release = ["build", "--release", "-p", "nunciod", "-p", "nuncio-cli"]
+# Remove the entire workspace target directory (all crates, all profiles).
+clean-all = "clean"

 [build]
 # Treat warnings as errors and forbid unsafe code at local build time
@@ -1,6 +1,6 @@
 # Contributing to Nuncio

-Thank you for contributing to Nuncio ([nuncio.mx](https://nuncio.mx))!
+Thank you for contributing to Nuncio!

 ## Semantic Versioning 2.0.0 & Tagging

@@ -9,7 +9,10 @@ Nuncio follows **Semantic Versioning 2.0.0** (`vMAJOR.MINOR.PATCH`):
 - `MINOR`: Incremented for new functionality added in a backward-compatible manner.
 - `PATCH`: Incremented for backward-compatible bug fixes.

-Tagging a commit with `vX.Y.Z` triggers [.github/workflows/release.yml](file:///R:/Git.Local/KofTwentyTwo/nuncio/.github/workflows/release.yml) to automatically compile cross-platform release artifacts (Windows `.zip`/`.msi`, macOS `.tar.gz`/`.dmg`, Linux `.tar.gz`/`.AppImage`), generate release notes from Conventional Commits, compute SHA256 checksums, and publish an official GitHub Release.
+Tagging a commit with `vX.Y.Z` is intended to drive the release workflow under
+`.github/workflows/`. **Pre-alpha note:** the release pipeline is being rebuilt and
+**no functional release exists yet** — see roadmap milestone M7 (issue #209). Do not
+tag releases until the backend is declared client-ready.

 ## Architecture Decoupling Rules

@@ -1,13 +1,17 @@
 # Security Policy

-Nuncio ([nuncio.mx](https://nuncio.mx)) takes security and data privacy seriously. Because Nuncio handles sensitive mail payloads, calendar schedules, and authentication credentials across Windows, macOS, and Linux, we maintain strict security disclosures and cryptographic standards.
+Nuncio handles sensitive mail, calendar, and contact data plus authentication
+credentials, so security is a first-class concern. **Status: pre-alpha.** Several
+hardening items — at-rest encryption correctness, key zeroization, a fail-closed
+signature-verifying updater, and transport/egress hardening — are tracked under
+roadmap milestone M6 and are not all complete. **Do not use Nuncio with real
+accounts or sensitive data yet.**

 ## Supported Versions

 | Version | Supported |
 | :--- | :--- |
-| `0.1.x` | Supported |
-| `< 0.1.0` | Unsupported |
+| all pre-1.0 | **Not supported** — non-functional pre-alpha, under active reconstruction |

 ## Reporting a Vulnerability

@@ -10,6 +10,9 @@ env:
  CARGO_TERM_COLOR: always
  RUSTFLAGS: "-D warnings"

+permissions:
+  contents: read
+
 jobs:
  fmt:
    name: Code Formatting Check
@@ -36,8 +39,8 @@ jobs:
          sudo apt-get install -y libglib2.0-dev libwebkit2gtk-4.1-dev libgtk-3-dev libayatana-appindicator3-dev librsvg2-dev build-essential curl wget file libssl-dev
      - name: Cache Cargo Dependencies
        uses: Swatinem/rust-cache@v2
-      - name: Run Clippy Linter
-        run: cargo clippy --workspace -- -D warnings
+      - name: Run Clippy Linter (all targets, matches local `cargo check-all`)
+        run: cargo check-all

  test:
    name: Test Suite Execution
@@ -68,8 +71,12 @@ jobs:
        uses: taiki-e/install-action@cargo-llvm-cov
      - name: Cache Cargo Dependencies
        uses: Swatinem/rust-cache@v2
-      - name: Measure & Enforce Code Coverage Threshold
-        run: cargo llvm-cov --workspace --ignore-filename-regex "main\.rs" --fail-under-lines 100
+      # Coverage is informational for now. The former `--fail-under-lines 100`
+      # gate excluded all main.rs (the integration wiring) and incentivized
+      # stub+matching-test theater. A realistic threshold plus a required
+      # mock-server E2E gate lands with Phase 1.C.6 (GH #143).
+      - name: Measure Code Coverage (informational)
+        run: cargo llvm-cov --workspace --ignore-filename-regex "main\.rs" --summary-only

  build-matrix:
    name: Cross-Platform Build Matrix (${{ matrix.os }})
@@ -1,11 +1,10 @@
 name: Nuncio Desktop GUI Release Pipeline (MSI, DMG, AppImage, Deb)

 on:
+  # Desktop installers are built ONLY from version tags (per the release policy).
+  # Branch-push triggers were removed during the pre-alpha rebuild: they ran on
+  # every dev push and failed (the Tauri GUI is archived under _reference/).
  push:
-    branches:
-      - main
-      - rc
-      - dev
    tags:
      - 'v*'
  workflow_dispatch:
@@ -1,11 +1,9 @@
 name: Nuncio Nightly & Snapshot Release Pipeline

 on:
-  push:
-    branches:
-      - dev
-  schedule:
-    - cron: '0 2 * * *' # Daily Nightly Build at 02:00 UTC
+  # Auto-nightly is DISABLED during the pre-alpha rebuild: no public releases
+  # until V3, and this pipeline builds the presentation GUI now archived under
+  # _reference/. Manual-only until the release path is restored in Phase 4.
  workflow_dispatch:

 permissions:
@@ -1,15 +1,13 @@
 name: Nuncio Multi-Platform Release Pipeline (Dev, RC, Prod)

 on:
+  # Releases are cut ONLY from version tags (vMAJOR.MINOR.PATCH), per the release
+  # policy (no public release until V3). Branch-push and nightly-cron triggers were
+  # removed during the pre-alpha rebuild: they ran on every dev push and failed
+  # (they build the presentation GUI now archived under _reference/).
  push:
-    branches:
-      - main
-      - rc
-      - dev
    tags:
      - 'v*'
-  schedule:
-    - cron: '0 0 * * *' # Daily Nightly Build at 00:00 UTC
  workflow_dispatch:

 permissions:
@@ -10,6 +10,9 @@ on:
      - '.github/workflows/wiki-sync.yml'
  workflow_dispatch:

+permissions:
+  contents: write
+
 jobs:
  sync-wiki:
    name: Sync docs/ to GitHub Wiki
@@ -27,15 +30,18 @@ jobs:
          token: ${{ secrets.GITHUB_TOKEN }}
          path: wiki-repo

-      - name: Sync docs and assets to Wiki
+      - name: Sync docs and assets to Wiki (mirror with delete)
        run: |
+          # Mirror docs/ -> wiki so that files removed from docs/ are also removed
+          # from the wiki. Preserve only the wiki's .git directory.
+          find wiki-repo -mindepth 1 -maxdepth 1 -not -name '.git' -exec rm -rf {} +
          mkdir -p wiki-repo/assets
          cp -r docs/* wiki-repo/ 2>/dev/null || true
          cp -r assets/* wiki-repo/assets/ 2>/dev/null || true
          cd wiki-repo
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
-          git add .
+          git add -A
          if git diff --staged --quiet; then
            echo "No changes to commit to Wiki."
          else
@@ -28,3 +28,10 @@ Thumbs.db
 **/build/
 package-lock.json

+
+# Agent scratch + regenerable build artifacts (keep out of the repo)
+.superpowers/
+excalidraw.log
+_reference/**/gen/
+**/node_modules/
+**/dist/
@@ -1,13 +1,12 @@
 <component name="ProjectRunConfigurationManager">
-  <configuration default="false" name="Run nuncio-gui" type="CargoCommandRunConfiguration" factoryName="Cargo Command">
-    <option name="command" value="run -p nuncio-gui" />
+  <configuration default="false" name="Cargo Build Release (daemon + CLI)" type="CargoCommandRunConfiguration" factoryName="Cargo Command">
+    <option name="command" value="build-release" />
    <option name="workingDirectory" value="file://$PROJECT_DIR$" />
    <option name="emulateTerminal" value="true" />
    <option name="channel" value="DEFAULT" />
    <option name="requiredFeatures" value="true" />
    <option name="allFeatures" value="false" />
    <option name="withSudo" value="false" />
-    <option name="buildTarget" value="REMOTE" />
    <option name="backtrace" value="SHORT" />
    <envs />
    <method v="2">
@@ -7,7 +7,6 @@
    <option name="requiredFeatures" value="true" />
    <option name="allFeatures" value="false" />
    <option name="withSudo" value="false" />
-    <option name="buildTarget" value="REMOTE" />
    <option name="backtrace" value="SHORT" />
    <envs />
    <method v="2">
@@ -0,0 +1,14 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="Cargo Clean" type="CargoCommandRunConfiguration" factoryName="Cargo Command">
+    <option name="command" value="clean" />
+    <option name="workingDirectory" value="file://$PROJECT_DIR$" />
+    <option name="emulateTerminal" value="true" />
+    <option name="channel" value="DEFAULT" />
+    <option name="requiredFeatures" value="true" />
+    <option name="allFeatures" value="false" />
+    <option name="withSudo" value="false" />
+    <option name="backtrace" value="SHORT" />
+    <envs />
+    <method v="2" />
+  </configuration>
+</component>
@@ -7,7 +7,6 @@
    <option name="requiredFeatures" value="true" />
    <option name="allFeatures" value="false" />
    <option name="withSudo" value="false" />
-    <option name="buildTarget" value="REMOTE" />
    <option name="backtrace" value="SHORT" />
    <envs />
    <method v="2">
@@ -7,7 +7,6 @@
    <option name="requiredFeatures" value="true" />
    <option name="allFeatures" value="false" />
    <option name="withSudo" value="false" />
-    <option name="buildTarget" value="REMOTE" />
    <option name="backtrace" value="SHORT" />
    <envs />
    <method v="2">
@@ -1,13 +1,12 @@
 <component name="ProjectRunConfigurationManager">
-  <configuration default="false" name="Run nuncio-tui" type="CargoCommandRunConfiguration" factoryName="Cargo Command">
-    <option name="command" value="run -p nuncio-tui" />
+  <configuration default="false" name="Cargo Verify (fmt + clippy + tests)" type="CargoCommandRunConfiguration" factoryName="Cargo Command">
+    <option name="command" value="verify" />
    <option name="workingDirectory" value="file://$PROJECT_DIR$" />
    <option name="emulateTerminal" value="true" />
    <option name="channel" value="DEFAULT" />
    <option name="requiredFeatures" value="true" />
    <option name="allFeatures" value="false" />
    <option name="withSudo" value="false" />
-    <option name="buildTarget" value="REMOTE" />
    <option name="backtrace" value="SHORT" />
    <envs />
    <method v="2">
@@ -0,0 +1,19 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="Run nuncio-cli (system status)" type="CargoCommandRunConfiguration" factoryName="Cargo Command">
+    <option name="command" value="run -p nuncio-cli -- system status" />
+    <option name="workingDirectory" value="file://$PROJECT_DIR$" />
+    <envs />
+    <option name="emulateTerminal" value="true" />
+    <option name="channel" value="DEFAULT" />
+    <option name="requiredFeatures" value="true" />
+    <option name="allFeatures" value="false" />
+    <option name="withSudo" value="false" />
+    <option name="buildTarget" value="REMOTE" />
+    <option name="backtrace" value="SHORT" />
+    <option name="isRedirectInput" value="false" />
+    <option name="redirectInputPath" value="" />
+    <method v="2">
+      <option name="CARGO.BUILD_TASK_PROVIDER" enabled="true" />
+    </method>
+  </configuration>
+</component>
@@ -1,13 +1,12 @@
 <component name="ProjectRunConfigurationManager">
-  <configuration default="false" name="Run nuncio-cli (status)" type="CargoCommandRunConfiguration" factoryName="Cargo Command">
-    <option name="command" value="run -p nuncio-cli -- status" />
+  <configuration default="false" name="Run nuncio-cli (account list)" type="CargoCommandRunConfiguration" factoryName="Cargo Command">
+    <option name="command" value="run -p nuncio-cli -- account list" />
    <option name="workingDirectory" value="file://$PROJECT_DIR$" />
    <option name="emulateTerminal" value="true" />
    <option name="channel" value="DEFAULT" />
    <option name="requiredFeatures" value="true" />
    <option name="allFeatures" value="false" />
    <option name="withSudo" value="false" />
-    <option name="buildTarget" value="REMOTE" />
    <option name="backtrace" value="SHORT" />
    <envs />
    <method v="2">
@@ -0,0 +1,16 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="Run nuncio-cli (mail list)" type="CargoCommandRunConfiguration" factoryName="Cargo Command">
+    <option name="command" value="run -p nuncio-cli -- mail list" />
+    <option name="workingDirectory" value="file://$PROJECT_DIR$" />
+    <option name="emulateTerminal" value="true" />
+    <option name="channel" value="DEFAULT" />
+    <option name="requiredFeatures" value="true" />
+    <option name="allFeatures" value="false" />
+    <option name="withSudo" value="false" />
+    <option name="backtrace" value="SHORT" />
+    <envs />
+    <method v="2">
+      <option name="CARGO.BUILD_TASK_PROVIDER" enabled="true" />
+    </method>
+  </configuration>
+</component>
@@ -0,0 +1,16 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="Run nuncio-cli (mail sync)" type="CargoCommandRunConfiguration" factoryName="Cargo Command">
+    <option name="command" value="run -p nuncio-cli -- mail sync" />
+    <option name="workingDirectory" value="file://$PROJECT_DIR$" />
+    <option name="emulateTerminal" value="true" />
+    <option name="channel" value="DEFAULT" />
+    <option name="requiredFeatures" value="true" />
+    <option name="allFeatures" value="false" />
+    <option name="withSudo" value="false" />
+    <option name="backtrace" value="SHORT" />
+    <envs />
+    <method v="2">
+      <option name="CARGO.BUILD_TASK_PROVIDER" enabled="true" />
+    </method>
+  </configuration>
+</component>
@@ -0,0 +1,16 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="Run nunciod (daemon)" type="CargoCommandRunConfiguration" factoryName="Cargo Command">
+    <option name="command" value="run -p nunciod" />
+    <option name="workingDirectory" value="file://$PROJECT_DIR$" />
+    <option name="emulateTerminal" value="true" />
+    <option name="channel" value="DEFAULT" />
+    <option name="requiredFeatures" value="true" />
+    <option name="allFeatures" value="false" />
+    <option name="withSudo" value="false" />
+    <option name="backtrace" value="SHORT" />
+    <envs />
+    <method v="2">
+      <option name="CARGO.BUILD_TASK_PROVIDER" enabled="true" />
+    </method>
+  </configuration>
+</component>
@@ -2,61 +2,143 @@

 This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

-Nuncio ([nuncio.mx](https://nuncio.mx)) is a cross-platform (Linux/macOS/Windows) mail, calendar, and contacts suite written in Rust: a central daemon plus four presentation shells (CLI, TUI, GUI, MCP).
+## What this repo is

-## Commands
+Nuncio is a **local-first mail, calendar, and contacts engine** written in Rust
+(edition 2021, Cargo workspace). It is **pre-alpha and under active
+reconstruction** after a 2026-07-26 forensic assessment found the original
+AI-generated proof of concept was largely non-functional and its documentation
+substantially fabricated. **Trust the code and this file over any older prose.**

-Cargo aliases are defined in `.cargo/config.toml`:
+Read these before substantive work:
+- [`docs/ROADMAP.md`](docs/ROADMAP.md) — the authoritative plan and target architecture (rendered page: <https://koftwentytwo.github.io/nuncio/roadmap/>)
+- [`docs/STORY-WORKFLOW.md`](docs/STORY-WORKFLOW.md) — how to execute a roadmap story (gates, patterns to mirror, branch/PR/review flow)
+- [`docs/HANDOFF.md`](docs/HANDOFF.md) — current state, branches, and the M1–M7 story index for picking up on a new machine
+- [`docs/adr/0001-engine-first-grpc-architecture.md`](docs/adr/0001-engine-first-grpc-architecture.md) — the governing architecture decision
+- [`docs/BACKLOG.md`](docs/BACKLOG.md) — engineering-ready Phase 0 / Phase 1 stories (Phase 2+ is in `docs/ROADMAP.md`)
+
+## Architecture (target)
+
+The daemon is the product; UIs are thin clients over a published contract.
+
+- **`nunciod`** owns all state (SQLite/WAL), credentials (OS keyring), protocol
+  sync logic, the filter engine, and all business logic. The `nuncio-*` library
+  crates are composed by the daemon.
+- The daemon **publishes a versioned gRPC API** (`proto/nuncio/v1/*.proto`, being
+  introduced in roadmap Phase 1) over **loopback TCP with a bearer-token
+  handshake** (token in the OS keyring). **Server-streaming RPCs carry push**
+  (new mail, sync progress, events).
+- The `.proto` files are the single source of truth for the contract. **Feature
+  parity across clients is guaranteed by the contract, not by discipline.**
+- **`nuncio-cli` is the in-repo reference client** and E2E driver. All other UIs
+  (native macOS/Windows GUIs, TUI, MCP bridge) become separate repositories.
+
+### Current vs target state
+
+The presentation shells (`nuncio-tui`, `nuncio-gui`, `nuncio-mcp`) have been moved
+to `_reference/` (out of the workspace) and will be rebuilt as separate native
+client repos. The daemon serves a single transport — the **gRPC API on loopback
+`127.0.0.1:9420`**; the old hand-rolled JSON-RPC IPC has been removed.
+
+### Library-first boundary
+
+Business logic, protocol clients, storage, search, and key management live in the
+headless crates (`nuncio-core`, `nuncio-store`, `nuncio-mail`, `nuncio-cal`,
+`nuncio-contacts`, `nuncio-filter`). Presentation code must remain a thin client
+of the daemon's API and hold no business logic or private data store.
+
+## Build, test, and quality gates
+
+Warnings are hard errors and `unsafe_code` is forbidden (see
+[`.cargo/config.toml`](.cargo/config.toml) and workspace lints in
+[`Cargo.toml`](Cargo.toml): `unwrap_used`, `expect_used`, `panic`, `todo` are all
+`deny`).
+
+Cargo aliases (defined in `.cargo/config.toml`):

 ```bash
-cargo check-all   # clippy --all-targets --workspace -- -D warnings
-cargo test-all    # cargo test --workspace
-cargo cov         # cargo llvm-cov --workspace --fail-under-lines 100 (requires cargo-llvm-cov)
-cargo verify      # fmt --check + check-all + test-all (run before every push/PR)
+cargo check-all   # = clippy --all-targets --workspace -- -D warnings   (the lint gate)
+cargo test-all    # = test --workspace
+cargo cov         # = llvm-cov --workspace --ignore-filename-regex main.rs --summary-only  (informational; needs cargo-llvm-cov)
+cargo verify      # = fmt --all --check + check-all + test-all
 ```

- Run a single test: `cargo test -p nuncio-store test_name` (or `cargo test --test integration_matrix` for root-level integration tests in `tests/`).
- CI's coverage gate excludes binary entry points: `cargo llvm-cov --workspace --ignore-filename-regex "main\.rs" --fail-under-lines 100`.
- The pre-commit hook (`.githooks/pre-commit`) runs fmt check, clippy, and the full test suite; a commit that hasn't passed `cargo verify` will fail it.
- GUI frontend (React 18 + Vite + TypeScript) lives in `crates/nuncio-gui/ui/`: `npm run dev` / `npm run build` from that directory. The Tauri shell (`crates/nuncio-gui/src-tauri/`) builds the frontend automatically via its `beforeBuildCommand`.
- Run shells: `cargo run -p nuncio-cli -- status`, `cargo run -p nuncio-tui`, `cargo run -p nuncio-gui`, `cargo run -p nunciod` (daemon).
+Common commands:

-Warnings are hard errors everywhere: `.cargo/config.toml` sets `rustflags = ["-D", "warnings", "-F", "unsafe_code", "-D", "unused_must_use"]`, and workspace lints in `Cargo.toml` deny `clippy::unwrap_used`, `clippy::expect_used`, `clippy::panic`, `clippy::todo`, `clippy::unimplemented`, and `clippy::unreachable`. `unwrap()`/`expect()` are permitted only in tests. Use `thiserror` error enums in library crates.
+```bash
+cargo build --workspace
+cargo test -p nuncio-store                       # one crate
+cargo test -p nuncio-filter parser::             # one module's tests
+cargo test -p nunciod --test daemon_e2e_test     # one integration suite
+cargo run -p nunciod                             # start the daemon (gRPC on 127.0.0.1:9420)
+cargo run -p nuncio-cli -- system status         # drive it via the CLI (daemon must be running)
+```

-## Architecture
+> **Gate status:** the workspace is green under the pinned toolchain
+> (`rust-toolchain.toml` = 1.97.1), so the local pre-commit hook runs the exact
+> `fmt`/`clippy --all-targets`/tests that CI does — "green locally" is CI-equivalent.
+> CI itself is paused until the GitHub Actions minutes reset (releases are tag-only).
+> Coverage is informational, not a 100% gate.

-**Hybrid daemon-first model.** All state, storage, credentials, and protocol sync live in a standalone background daemon (`nunciod`). The four UIs are thin clients that talk to it over OS-native IPC — a UNIX domain socket (`~/.nuncio/nuncio.sock`) on POSIX, a named pipe (`\\.\pipe\nuncio-ipc`) on Windows — using JSON-RPC 2.0 framing. The client side (`IpcClient`, in `crates/nuncio-core/src/ipc/`) auto-spawns the daemon and retries; the server side (`IpcDaemonServer`) fans events out to all connected shells via the `nuncio-core` `EventBus` (`CoreCommand` in, `CoreEvent`/`AppState` snapshots out).
+## RustRover / IDE

-**Headless engine crates** (all business logic MUST live here, never in shells):
+A shared RustRover setup lives in `.idea/` (the useful parts are tracked;
+`workspace.xml`/`*.iml` and other local churn are gitignored):
+- **Cargo project** auto-resolves from the root `Cargo.toml`; after pulling changes
+  that add or move crates, run **Reload Cargo Project** (RustRover usually prompts).
+- **Toolchain** comes from `rust-toolchain.toml` (1.97.1) automatically.
+- **rustfmt on save** is enabled (`.idea/codeStyles/Project.xml`).
+- **Shared run configurations** (`.idea/runConfigurations/`):
+  - *Run nunciod (daemon)* — start the daemon.
+  - *Run nuncio-cli (system status)* — drive it (start the daemon first).
+  - *Cargo Build Release (daemon + CLI)* — `cargo build-release`.
+  - *Cargo Check All* · *Cargo Test All* · *Cargo Verify (fmt + clippy + tests)* — the gates.
+  - *Cargo Coverage* — informational `llvm-cov` (needs `cargo-llvm-cov` installed).
+- Tip: set Clippy as the external linter (Settings → Rust → External Linters) so the
+  editor mirrors the `-D warnings` gate.
+- **Full walkthrough:** [`docs/DEVELOPING-IN-RUSTROVER.md`](docs/DEVELOPING-IN-RUSTROVER.md)
+  — setup, running the daemon + CLI, running/debugging tests, gates, and the dev loop.

- `nuncio-core` — domain models (`Email`, `CalendarEvent`, `Contact`), `EventBus`, IPC client/server + framing, config, E2EE (OpenPGP/S-MIME), WASM plugins, `McpAgentPolicy` RBAC, WORM audit, self-update.
- `nuncio-mail` — IMAP4rev1, JMAP (RFC 8620/8621), SMTP (`lettre`), MIME parsing.
- `nuncio-cal` — CalDAV (RFC 4791), iCalendar (RFC 5545), `rrule` recurrence, NLP scheduler.
- `nuncio-contacts` — CardDAV sync (RFC 6352), vCard 4.0, email contact harvester.
- `nuncio-store` — SQLite WAL (`sqlx`), FTS5 trigram search, AES-256-GCM + `age` encryption at rest, OS keyring vault, WORM audit ledger.
- `nuncio-filter` — NSQL declarative filter language (parsed with `sqlparser`), AST actions, validator, dry-run, HMAC webhooks. Spec: `docs/NSQL-Filter-Language-Specification.md`.
+## Conventions

-**Presentation shells** (thin UI layers over `IpcClient` only): `nuncio-cli` (Noun+Verb subcommands, `--json` output), `nuncio-tui` (Ratatui, Vim keys), `nuncio-gui` (Rust view/sandbox layer + `src-tauri` Tauri v2 shell + `ui/` React frontend — two workspace crates plus an npm package), `nuncio-mcp` (MCP stdio server exposing tools/resources/prompts to LLM agents), `nunciod` (the daemon binary itself).
+- **Rust edition 2021**; `cargo fmt` enforced (no unformatted code).
+- **Error handling:** `thiserror` in library crates; `unwrap()`/`expect()` are
+  forbidden in production code (tests only).
+- **Security:** never store plaintext credentials/keys in source or SQLite; route
+  secrets through the OS keyring; encrypt attachments at rest; sandbox untrusted
+  HTML email in an `<iframe sandbox>` with JS disabled. (Several of these are
+  aspirational in the current tree — see the assessment; Phase 0.E hardens them.)
+- **Commits:** Conventional Commits (`feat(scope): …`, `fix(scope): …`), imperative,
+  <72-char subjects, no AI attribution.
+- **Comments:** explain the code's *intent, constraints, and rationale*. Do NOT
+  put backlog-story numbers (`1.C.2`), GH issue references (`#156`, `GH-156`,
+  `Refs #`), or `Phase N` breadcrumbs in source comments (`.rs`/`.proto`) — that
+  traceability belongs in git history and `docs/`, and it rots in the code.
+  Keep genuine technical rationale (RFC citations, algorithm notes, why-not-X).
+  (Commit messages may still cite `Refs #NNN`.)
+- **Branches:** feature branches; never commit directly to `main`. Branch flow is
+  `dev` → `rc` → `main`.
+- **A capability is "done" only when engine + proto + CLI command + offline E2E
+  test all exist and CI is green.** No fabricated success output — an unimplemented
+  path returns an honest error, never fake data.
+- **Roadmap is dual-format — keep it in sync.** `docs/ROADMAP.md` is the source of
+  truth; `docs/roadmap/index.html` is its rendered GitHub Pages page
+  (<https://koftwentytwo.github.io/nuncio/roadmap/>, linked from `README.md`).
+  Any change to milestones, status, or scope MUST update **both** in the same
+  commit — never let the rendered page drift from the markdown, and keep the
+  `README.md` link valid.

-**Standing rule — 100% four-shell feature parity.** Any feature exposed in one shell MUST be implemented in all four: CLI subcommand (with `--json`), TUI keybinding/modal, GUI React component, and MCP tool handler.
+## Testing standards

-## Testing
+- 100% of `cargo test-all` must pass before committing.
+- Integration tests use ephemeral SQLite (`tempfile` / `:memory:`); no state
+  leakage between tests.
+- **All external protocols (IMAP/JMAP/SMTP/CalDAV/CardDAV) must be mocked**
+  (`wiremock` or the `Mock*Backend` traits); the OS keyring is mocked via
+  `MockKeyring`. **Live network calls in tests are forbidden.**

- 100% line coverage is enforced (`cargo cov`); all workspace tests must pass locally before committing.
- Live network calls in tests are forbidden. Mock all protocols (IMAP/JMAP/SMTP/CalDAV/CardDAV) with `wiremock` or mock traits (`MockMailBackend`, `MockCalendarBackend`), and the OS vault with the in-memory `MockKeyring`.
- Integration/E2E tests use isolated ephemeral SQLite databases (`tempfile` or `:memory:`, e.g. `DatabaseEngine::connect_ephemeral()`); no state leakage between tests. Root-level `tests/` holds the cross-crate E2E matrix (`integration_matrix.rs`, `ephemeral_harness.rs`).
+## Release policy

-## Security
-
- Never store plain-text passwords, tokens, or keys in source or SQLite — credentials go to OS vaults via `keyring`; attachments encrypted at rest via `age`; credential fields use `ZeroizeOnDrop`.
- Untrusted HTML email renders only inside `<iframe sandbox>` with JS disabled.
-
-## Commits, Branches & Releases
-
- Conventional Commits (`feat(scope): description`), subject under 72 chars, imperative mood, zero AI attribution.
- All work on feature branches (`feature/GH-123-description`); never commit directly to `main`.
- SemVer 2.0.0; tags `vMAJOR.MINOR.PATCH`. **Unified V3 release mandate:** no public release tag or binary until Phase V3 is 100% complete and verified across all four shells on Linux, macOS, and Windows. Pushing a `v*.*.*` tag triggers `.github/workflows/release.yml` (packages + SHA256 checksums for `.zip`/`.msi`, `.tar.gz`/`.dmg`, `.tar.gz`/`.AppImage`).
-
-## Planning & Task Tracking
-
-Roadmap and issue state live on GitHub (Project board #5, milestones, issues) and in `docs/` (`PLAN-production-roadmap-100-plus.md`, `TODO.md`, `SESSION-STATE.md`). In the multi-agent split, Claude Code owns the headless engine crates (`nuncio-core`, `nuncio-mail`, `nuncio-cal`, `nuncio-store`, and by extension `nuncio-contacts`/`nuncio-filter`): protocol parsers, FTS5 migrations, `rrule` math, encryption, and coverage. CLI work is assigned to Codex; TUI/GUI/CI to Antigravity workers.
+SemVer 2.0.0; release tags are `vMAJOR.MINOR.PATCH`. **No release should be
+presented as functional until the engine and its API are solid (roadmap Phase 4).**
+Existing public pre-1.0 releases are non-functional and are being marked pre-alpha.
@@ -5,14 +5,11 @@ members = [
    "crates/nuncio-mail",
    "crates/nuncio-cal",
    "crates/nuncio-store",
-    "crates/nuncio-tui",
-    "crates/nuncio-gui",
-    "crates/nuncio-gui/src-tauri",
    "crates/nuncio-cli",
-    "crates/nuncio-mcp",
    "crates/nunciod",
    "crates/nuncio-filter",
    "crates/nuncio-contacts",
+    "crates/nuncio-proto",
 ]

 [workspace.package]
@@ -81,6 +78,12 @@ hex = "0.4"
 flate2 = "1.0"
 tar = "0.4"
 zip = { version = "8.6", default-features = false, features = ["deflate"] }
+tonic = "0.14"
+tonic-prost = "0.14"
+prost = "0.14"
+tonic-prost-build = "0.14"
+protoc-bin-vendored = "3.2"
+subtle = "2.6"



@@ -1,176 +1,73 @@
 # Nuncio

-<p align="center">
-  <img src="assets/nuncio_app_icon.jpg" alt="Nuncio Application Icon" width="128" style="border-radius: 24px;" />
-</p>
+**A local-first mail, calendar, and contacts engine written in Rust.**

-<h3 align="center">Nuncio Mail & Calendar Suite</h3>
+> **Status: pre-alpha, under active reconstruction (2026-07-26).**
+> Nuncio began as an AI-generated proof of concept. A forensic assessment found
+> that while several library-layer components are genuinely well-built, the
+> end-to-end product did not work and much of the prior documentation was
+> inaccurate. The project is being rebuilt engine-first. **It is not usable yet,
+> and published pre-1.0 releases are non-functional — do not install them.**
+> See the **[live roadmap](https://koftwentytwo.github.io/nuncio/roadmap/)**
+> (source: [`docs/ROADMAP.md`](docs/ROADMAP.md)) for the plan and
+> [`docs/adr/0001-engine-first-grpc-architecture.md`](docs/adr/0001-engine-first-grpc-architecture.md)
+> for the architecture decision.

-<p align="center">
-  <b>High-Performance Library-First Messenger and Calendar Courier for Developers, Power Users, and AI Agents</b>
-</p>
+## What Nuncio is

-<p align="center">
-  <a href="https://nuncio.mx">Official Site: nuncio.mx</a> •
-  <a href="https://github.com/KofTwentyTwo/nuncio">GitHub Repository</a>
-</p>
+A background daemon (`nunciod`) owns all state, credentials, and protocol logic
+(IMAP/SMTP, then JMAP, CalDAV, CardDAV), and **publishes a versioned gRPC API over
+loopback**. User interfaces are separate native client projects that consume that
+API — they hold no business logic and no data of their own. This makes feature
+parity across clients a property of the published contract rather than a matter of
+discipline.

-> **Etymology**: Derived from the Latin verb ***nūntiō*** ("I announce", "I declare", "I deliver a message") and noun ***nūntius*** ("messenger", "courier", "bearer of tidings"). Nuncio is built as the ultimate cross-platform messenger and calendar courier across Linux, macOS, and Windows.
+The only client in this repository is `nuncio-cli`, which serves as the reference
+API consumer and the driver for end-to-end tests. Native GUIs (macOS/Windows), a
+TUI, and an MCP bridge will live in separate repositories once the engine and its
+API are solid.

---
+## Workspace layout

-## Visual Application Preview
+Engine libraries composed by the daemon:

-![Nuncio Desktop Application UI Preview](assets/nuncio_gui_hero.jpg)
-
---
-
-## 4 Great Interfaces + Central Daemon Topology
-
-Nuncio operates on a **Hybrid Daemon-First Architecture**. Centralized state management, SQLite WAL persistence, credential security enclaves, and protocol synchronizers reside inside a standalone background daemon (`nunciod`). Four decoupled interfaces communicate with `nunciod` over native IPC socket streams:
-
-```mermaid
-graph TD
-    subgraph Four Great Interfaces
-        CLI["nuncio-cli (POSIX CLI)"]
-        TUI["nuncio-tui (Ratatui TUI)"]
-        GUI["nuncio-gui (Tauri v2 Desktop GUI)"]
-        MCP["nuncio-mcp (Native MCP LLM Agent Interface)"]
-    end
-
-    subgraph IPC Client Engine
-        Client["IpcClient (Auto-Spawn + Retry Loop + JSON-RPC 2.0 Framing)"]
-    end
-
-    subgraph Native OS Sockets
-        UnixSocket["POSIX: UNIX Domain Socket (~/.nuncio/nuncio.sock)"]
-        WinPipe["Windows: Named Pipe (\\\\.\\pipe\\nuncio-ipc)"]
-    end
-
-    subgraph Central Background Daemon
-        DaemonServer["IpcDaemonServer (Security Enclave)"]
-        DaemonProcess["nunciod Daemon Process"]
-        EventBus["nuncio-core EventBus"]
-    end
-
-    subgraph Core Engine & Protocol Libraries
-        MailEngine["nuncio-mail (IMAP / SMTP / JMAP)"]
-        CalEngine["nuncio-cal (CalDAV / iCal / rrule)"]
-        StoreEngine["nuncio-store (SQLite WAL / FTS5 Trigram / Age Cipher)"]
-    end
-
-    CLI --> Client
-    TUI --> Client
-    GUI --> Client
-    MCP --> Client
-
-    Client --> UnixSocket
-    Client --> WinPipe
-
-    UnixSocket --> DaemonServer
-    WinPipe --> DaemonServer
-
-    DaemonServer --> DaemonProcess
-    DaemonProcess --> EventBus
-
-    EventBus --> MailEngine
-    EventBus --> CalEngine
-    EventBus --> StoreEngine
-```
-
-1. **`nuncio-cli` (POSIX CLI)**: Scriptable `<Noun> <Verb>` commands with deterministic `--json` output and offline-resilient local SQLite reads.
-2. **`nuncio-tui` (Terminal TUI)**: Keyboard-first 3-pane split view built in Ratatui with Vim navigation (`j`/`k`/`h`/`l`) and live `CoreEvent` push updates.
-3. **`nuncio-gui` (Tauri v2 Desktop GUI)**: Cross-platform native window host with React 18 + Vite + TypeScript frontend, glassmorphic styling, and strict HTML `<iframe sandbox>` CSP email rendering.
-4. **`nuncio-mcp` (Native LLM Agent UI)**: Model Context Protocol (MCP) JSON-RPC 2.0 stdio server exposing tools (`nuncio_mail_send`, `nuncio_cal_create_event`), resources (`nuncio://mail/inbox`), and prompts for local AI agents (Claude, Cursor, Antigravity).
-5. **`nunciod` (Central Daemon Binary)**: Standalone background process owning SQLite WAL storage, security enclaves, background protocol sync loops, and multi-client IPC socket streams.
-
---
-
-## Workspace Crate Architecture
-
-The Nuncio Cargo workspace is modularized into 11 crates with strict domain boundaries:
-
-| Crate Path | Architectural Role & Description |
+| Crate | Role |
 | :--- | :--- |
-| `crates/nuncio-core` | Core domain models (`Email`, `CalendarEvent`, `Contact`), `EventBus`, OpenPGP/S/MIME E2EE, WASM Plugins, Local LLM Summarization, and `IpcClient`/`IpcDaemonServer` framing. |
-| `crates/nuncio-mail` | IMAP4rev1, JMAP (RFC 8620/8621), SMTP transport engines, and MIME stream parser. |
-| `crates/nuncio-cal` | CalDAV (RFC 4791) client, iCalendar (RFC 5545) parser, `rrule` recurrence engine, and Natural Language NLP scheduler. |
-| `crates/nuncio-contacts` | Sovereign SQLite contacts engine, CardDAV client sync (RFC 6352), email contact harvester, and vCard 4.0 generator. |
-| `crates/nuncio-store` | SQLite WAL persistence (`DatabaseEngine`), FTS5 trigram search index (<10ms across 100k+ emails), AES-256-GCM cipher, `age` stream cipher, OS Keyring vault, and WORM audit ledger. |
-| `crates/nuncio-filter` | Declarative NSQL filter engine (`sqlparser 0.54`), AST actions, 6-pass validator, dry-run tester, and HMAC webhooks. |
-| `crates/nuncio-cli` | Pure Noun + Verb CLI runner and Unix pipe scripting engine. |
-| `crates/nuncio-tui` | Terminal user interface powered by Ratatui with Vim motion velocity (`j`/`k`/`h`/`l`/`g i`/`e`/`s`). |
-| `crates/nuncio-gui` | Native desktop GUI application shell powered by Tauri v2 and React. |
-| `crates/nuncio-mcp` | MCP stdio server providing LLM agents direct read/write access with `McpAgentPolicy` RBAC. |
-| `crates/nunciod` | Standalone background daemon binary server. |
+| `crates/nuncio-core` | Domain models, event bus, IPC/API layer, cross-cutting services |
+| `crates/nuncio-store` | SQLite (WAL) persistence, FTS search, ciphers, corruption recovery, keyring vault |
+| `crates/nuncio-mail` | IMAP, JMAP, SMTP protocol engines and MIME handling |
+| `crates/nuncio-cal` | iCalendar, CalDAV, CardDAV, recurrence, scheduling |
+| `crates/nuncio-contacts` | Contacts store, CardDAV sync, vCard |
+| `crates/nuncio-filter` | NSQL declarative filter language (parser, validator, engine) |
+| `crates/nunciod` | The daemon binary — owns state and serves the API |
+| `crates/nuncio-cli` | Reference API client + E2E driver |

---
+The former `nuncio-tui`, `nuncio-gui`, and `nuncio-mcp` shells have been moved to
+`_reference/` (out of the workspace) and will be rebuilt as separate client
+repositories (roadmap Phase 5).

-## CLI Command Usage (Pure Noun + Verb Syntax)
-
-Nuncio CLI enforces standardized `<Noun> <Verb> [Flags]` syntax with optional `--json` output envelopes:
+## Build & test

 ```bash
-# Account Management
-nuncio account add --email james.maes@kof22.com --imap-host mail.kof22.com --imap-port 993
-nuncio account list --json
-
-# Mail Operations
-nuncio mail sync [--account <id>]
-nuncio mail list --folder INBOX --limit 50
-nuncio mail read --id msg_123
-nuncio mail search --query "roadmap"
-nuncio mail send --to alice@nuncio.mx --subject "Release Update" --body "Message body"
-
-# Calendar Operations
-nuncio cal list --calendar work
-nuncio cal create --summary "Team Standup" --start 1774348800 --end 1774352400
-
-# System Status
-nuncio system status --json
-nuncio daemon
+cargo build --workspace          # build everything
+cargo check-all                  # clippy, all targets, warnings-as-errors (the gate)
+cargo test-all                   # run the whole test suite
+cargo verify                     # fmt --check + check-all + test-all
+cargo test -p nuncio-store       # test a single crate
 ```

---
+Cargo aliases are defined in [`.cargo/config.toml`](.cargo/config.toml).

-## Quality Gates & Verification Commands
+## Documentation

-Build configurations enforce strict zero-warning policy (`-D warnings -F unsafe_code -D unused_must_use`):
+- **[Roadmap — live rendered page](https://koftwentytwo.github.io/nuncio/roadmap/)** — the visual plan to a client-ready backend (GitHub Pages)
+- [`docs/ROADMAP.md`](docs/ROADMAP.md) — authoritative roadmap and target architecture (source for the page above)
+- [`docs/STORY-WORKFLOW.md`](docs/STORY-WORKFLOW.md) — how contributors execute a roadmap story (gates, patterns, review flow)
+- [`docs/HANDOFF.md`](docs/HANDOFF.md) — development handoff: current state, branches, and the M1–M7 story index
+- [`docs/BACKLOG.md`](docs/BACKLOG.md) — engineering-ready Phase 0 / Phase 1 stories
+- [`docs/adr/`](docs/adr/) — architecture decision records
+- [`docs/ARCHITECTURE.md`](docs/ARCHITECTURE.md) — technical architecture

-```bash
-# 1. Compiler & Linter Quality Gate (Zero warnings allowed)
-cargo check --workspace
-cargo clippy --workspace -- -D warnings
+## License

-# 2. Run Full Integration Test Suite (100 tests across 9 crates)
-cargo test --workspace
-
-# 3. Formatter Gate
-cargo fmt --all --check
-```
-
---
-
-## Master Architectural Documentation & Roadmaps
-
- **[Enhanced Production Roadmap (V1, V2, V3)](docs/PLAN-enhanced-roadmap-v1-v2-v3.md)**: Deep commercial feature specification benchmarked against Superhuman, Mimestream, Apple Mail, Outlook, Hey, Cron, and Fantastical.
- **[Hybrid Daemon Architecture Blueprint](docs/PLAN-hybrid-daemon-architecture.md)**: Sockets, framing, auto-spawning, and security enclave design.
- **[Executive Audit Review Report](docs/EXECUTIVE-AUDIT-REVIEW.md)**: Authoritative technical audit scorecard across architecture, security, code quality, UI/UX, and performance.
- **[Architecture Specification](docs/ARCHITECTURE.md)**: Domain encapsulation, Hexagonal Ports & Adapters model, and IPC streaming contracts.
-
---
-
-## Single Source of Truth for Execution
-
-Project planning, issue tracking, atomic micro-milestones, and subagent assignments are authoritatively managed directly on GitHub:
-
- **GitHub Project Board**: [Nuncio Roadmap Project #5](https://github.com/users/KofTwentyTwo/projects/5)
- **GitHub Milestones**: [KofTwentyTwo/nuncio/milestones](https://github.com/KofTwentyTwo/nuncio/milestones) (`v0.1.0` through `v1.0.0`)
- **GitHub Issues**: [KofTwentyTwo/nuncio/issues](https://github.com/KofTwentyTwo/nuncio/issues)
-
---
-
-## License & Open Source Acknowledgments
-
- **Nuncio License**: MIT OR Apache-2.0
- **Third-Party Open Source Libraries**: See **[THIRD_PARTY_LICENSES.md](THIRD_PARTY_LICENSES.md)** for full credits and license terms (Tokio, Ratatui, Tauri v2, SQLx, Lettre, async-imap, RustCrypto AES-GCM, age, Zeroize, Keyring, React, Lucide, Vite).
+MIT OR Apache-2.0.
@@ -0,0 +1,40 @@
+# `_reference/` — archived pre-gRPC presentation shells
+
+This directory holds three presentation shells that were removed from the
+Cargo workspace (backlog **0.D.2**, GH-145) as part of shrinking the
+workspace to just the engine, the daemon, and the reference CLI:
+
+- `nuncio-tui` — the Ratatui terminal UI shell
+- `nuncio-gui` — the Rust GUI core plus its `src-tauri` Tauri desktop shell
+  and its `ui/` React/Vite frontend
+- `nuncio-mcp` — the MCP (Model Context Protocol) server shell for LLM tool
+  access
+
+They were built directly against the in-process `nuncio-core`/`nuncio-mail`/
+`nuncio-cal`/`nuncio-store`/`nuncio-filter`/`nuncio-contacts` library APIs,
+from the pre-gRPC phase of the project. Per the target architecture in
+[`docs/ROADMAP.md`](../docs/ROADMAP.md), `nunciod` is moving to publish a
+versioned gRPC API over loopback, and every presentation shell other than
+the in-repo `nuncio-cli` reference client is planned to live in its own
+separate native client repository (**Phase 5 — Client projects**):
+`nuncio-tui`, `nuncio-gui-macos`, `nuncio-gui-windows`, `nuncio-mcp`, etc.
+
+**This code is retained intact, not deleted**, so it can be mined for UI/UX
+ideas, keybindings, view layout, and MCP tool-surface design when those
+Phase 5 client repos are built against the new gRPC API. It is **not**
+built, checked, or tested by the root Cargo workspace — none of these
+directories are members of the workspace `Cargo.toml`, so
+`cargo build --workspace`, `cargo check-all`, and `cargo test --workspace`
+never touch them.
+
+Each crate's internal `path = "../..."` dependencies on the engine crates
+have been updated to point at `../../crates/<name>` (e.g.
+`_reference/nuncio-tui/Cargo.toml` now points at `../../crates/nuncio-core`)
+so the crate sources still resolve correctly relative to their new location.
+They are **not guaranteed to build standalone** as-is: they still declare
+`*.workspace = true` fields (`version`, `edition`, `lints`, and workspace
+`[dependencies]` aliases) that only resolve inside a Cargo workspace, and
+they are not their own workspace root. Restoring a standalone build (for
+mining or resurrection) will require either vendoring those workspace
+values directly into each `Cargo.toml`, or giving `_reference/` its own
+`[workspace]` root.
@@ -10,10 +10,10 @@ repository.workspace = true
 workspace = true

 [dependencies]
-nuncio-core = { path = "../nuncio-core" }
-nuncio-mail = { path = "../nuncio-mail" }
-nuncio-cal = { path = "../nuncio-cal" }
-nuncio-store = { path = "../nuncio-store" }
+nuncio-core = { path = "../../crates/nuncio-core" }
+nuncio-mail = { path = "../../crates/nuncio-mail" }
+nuncio-cal = { path = "../../crates/nuncio-cal" }
+nuncio-store = { path = "../../crates/nuncio-store" }
 tokio.workspace = true
 serde.workspace = true
 serde_json.workspace = true
@@ -10,7 +10,7 @@ repository.workspace = true
 workspace = true

 [dependencies]
-nuncio-core = { path = "../../nuncio-core" }
+nuncio-core = { path = "../../../crates/nuncio-core" }
 nuncio-gui = { path = ".." }
 tauri = { version = "2.0", features = [] }
 tauri-plugin-updater = "2.0"
@@ -1,5 +1,7 @@
 //! Nuncio GUI Desktop Library.

+#![cfg_attr(test, allow(clippy::unwrap_used, clippy::expect_used, clippy::panic))]
+
 pub mod ipc;
 pub mod sandbox;
 pub mod view;
@@ -1,5 +1,7 @@
 //! E2E System Test Suite for nuncio-gui.

+#![allow(clippy::unwrap_used, clippy::expect_used, clippy::panic)]
+
 use nuncio_core::{EngineStatus, EventBus};
 use nuncio_gui::{GuiViewState, HtmlSanitizer, IpcBridge, IpcCommandPayload};

@@ -10,12 +10,12 @@ repository.workspace = true
 workspace = true

 [dependencies]
-nuncio-core = { path = "../nuncio-core" }
-nuncio-mail = { path = "../nuncio-mail" }
-nuncio-cal = { path = "../nuncio-cal" }
-nuncio-store = { path = "../nuncio-store" }
-nuncio-filter = { path = "../nuncio-filter" }
-nuncio-contacts = { path = "../nuncio-contacts" }
+nuncio-core = { path = "../../crates/nuncio-core" }
+nuncio-mail = { path = "../../crates/nuncio-mail" }
+nuncio-cal = { path = "../../crates/nuncio-cal" }
+nuncio-store = { path = "../../crates/nuncio-store" }
+nuncio-filter = { path = "../../crates/nuncio-filter" }
+nuncio-contacts = { path = "../../crates/nuncio-contacts" }


 tokio = { workspace = true, features = ["full"] }
@@ -2,6 +2,8 @@
 //! Exposes a 4th presentation shell ("Native LLM Agent UI") allowing AI models
 //! full access to email, calendar, search, and storage features.

+#![cfg_attr(test, allow(clippy::unwrap_used, clippy::expect_used, clippy::panic))]
+
 pub mod resources;
 pub mod server;
 pub mod tools;
@@ -48,13 +48,15 @@ impl McpResourceHandler {
            McpResourceDefinition {
                uri: "nuncio://filters".to_string(),
                name: "NSQL Filter Rules".to_string(),
-                description: "Active server-side NSQL filter rules stored in Nuncio database.".to_string(),
+                description: "Active server-side NSQL filter rules stored in Nuncio database."
+                    .to_string(),
                mime_type: "application/json".to_string(),
            },
            McpResourceDefinition {
                uri: "nuncio://system/status".to_string(),
                name: "System Health & Recovery Diagnostic Status".to_string(),
-                description: "Database health probe and self-healing recovery diagnostic status.".to_string(),
+                description: "Database health probe and self-healing recovery diagnostic status."
+                    .to_string(),
                mime_type: "application/json".to_string(),
            },
        ]
@@ -76,7 +78,11 @@ impl McpResourceHandler {
                Ok(json!({ "uri": uri, "content": accounts }))
            }
            "nuncio://filters" => {
-                let rules = self.db.list_filter_rules().await.map_err(|e| e.to_string())?;
+                let rules = self
+                    .db
+                    .list_filter_rules()
+                    .await
+                    .map_err(|e| e.to_string())?;
                Ok(json!({ "uri": uri, "content": rules }))
            }
            "nuncio://system/status" => {
@@ -21,7 +21,10 @@ impl McpServer {
        let (db_engine, dir) = DatabaseEngine::connect_ephemeral().await?;
        let db = Arc::new(db_engine);
        Ok(Self {
-            tools: McpToolHandler::with_policy(db.clone(), nuncio_core::McpAgentPolicy::unrestricted("stdio-agent")),
+            tools: McpToolHandler::with_policy(
+                db.clone(),
+                nuncio_core::McpAgentPolicy::unrestricted("stdio-agent"),
+            ),
            resources: McpResourceHandler::new(db),
            _tempdir: Some(Arc::new(dir)),
        })
@@ -30,7 +33,10 @@ impl McpServer {
    /// Create a new `McpServer` wrapping shared `DatabaseEngine`.
    pub fn new(db: Arc<DatabaseEngine>) -> Self {
        Self {
-            tools: McpToolHandler::with_policy(db.clone(), nuncio_core::McpAgentPolicy::unrestricted("stdio-agent")),
+            tools: McpToolHandler::with_policy(
+                db.clone(),
+                nuncio_core::McpAgentPolicy::unrestricted("stdio-agent"),
+            ),
            resources: McpResourceHandler::new(db),
            _tempdir: None,
        }
@@ -299,13 +299,24 @@ impl McpToolHandler {
    pub async fn call_tool(&self, name: &str, args: Value) -> Result<Value, String> {
        match name {
            "nuncio_mail_list" => {
-                if !self.policy.is_data_type_allowed(DataType::Mail) || !self.policy.permissions.read_mail {
-                    return Err(format!("403 Forbidden: Agent '{}' lacks 'read_mail' permission", self.policy.agent_id));
+                if !self.policy.is_data_type_allowed(DataType::Mail)
+                    || !self.policy.permissions.read_mail
+                {
+                    return Err(format!(
+                        "403 Forbidden: Agent '{}' lacks 'read_mail' permission",
+                        self.policy.agent_id
+                    ));
                }
                let limit = args.get("limit").and_then(|v| v.as_u64()).unwrap_or(20) as usize;
-                let folder_id = args.get("folder_id").and_then(|v| v.as_str()).unwrap_or("INBOX");
+                let folder_id = args
+                    .get("folder_id")
+                    .and_then(|v| v.as_str())
+                    .unwrap_or("INBOX");
                if !self.policy.is_folder_allowed(folder_id) {
-                    return Err(format!("403 Forbidden: Agent '{}' is restricted from folder '{}'", self.policy.agent_id, folder_id));
+                    return Err(format!(
+                        "403 Forbidden: Agent '{}' is restricted from folder '{}'",
+                        self.policy.agent_id, folder_id
+                    ));
                }
                let messages = self
                    .db
@@ -330,16 +341,36 @@ impl McpToolHandler {
                Ok(json!({ "messages": filtered }))
            }
            "nuncio_mail_send" => {
-                if !self.policy.is_data_type_allowed(DataType::Mail) || !self.policy.permissions.send_mail {
-                    return Err(format!("403 Forbidden: Agent '{}' lacks 'send_mail' permission", self.policy.agent_id));
+                if !self.policy.is_data_type_allowed(DataType::Mail)
+                    || !self.policy.permissions.send_mail
+                {
+                    return Err(format!(
+                        "403 Forbidden: Agent '{}' lacks 'send_mail' permission",
+                        self.policy.agent_id
+                    ));
                }
-                let account_id = args.get("account_id").and_then(|v| v.as_str()).ok_or("missing account_id")?;
+                let account_id = args
+                    .get("account_id")
+                    .and_then(|v| v.as_str())
+                    .ok_or("missing account_id")?;
                if !self.policy.is_account_allowed(account_id) {
-                    return Err(format!("403 Forbidden: Agent '{}' is restricted from account '{}'", self.policy.agent_id, account_id));
+                    return Err(format!(
+                        "403 Forbidden: Agent '{}' is restricted from account '{}'",
+                        self.policy.agent_id, account_id
+                    ));
                }
-                let recipient = args.get("recipient").and_then(|v| v.as_str()).ok_or("missing recipient")?;
-                let subject = args.get("subject").and_then(|v| v.as_str()).ok_or("missing subject")?;
-                let body = args.get("body").and_then(|v| v.as_str()).ok_or("missing body")?;
+                let recipient = args
+                    .get("recipient")
+                    .and_then(|v| v.as_str())
+                    .ok_or("missing recipient")?;
+                let subject = args
+                    .get("subject")
+                    .and_then(|v| v.as_str())
+                    .ok_or("missing subject")?;
+                let body = args
+                    .get("body")
+                    .and_then(|v| v.as_str())
+                    .ok_or("missing body")?;

                let email = Email {
                    id: format!("mcp-outbound-{}", chrono::Utc::now().timestamp_millis()),
@@ -365,13 +396,24 @@ impl McpToolHandler {
                Ok(json!({ "status": "queued_and_saved", "email_id": email.id }))
            }
            "nuncio_mail_search" => {
-                if !self.policy.is_data_type_allowed(DataType::Mail) || !self.policy.permissions.read_mail {
-                    return Err(format!("403 Forbidden: Agent '{}' lacks 'read_mail' permission", self.policy.agent_id));
+                if !self.policy.is_data_type_allowed(DataType::Mail)
+                    || !self.policy.permissions.read_mail
+                {
+                    return Err(format!(
+                        "403 Forbidden: Agent '{}' lacks 'read_mail' permission",
+                        self.policy.agent_id
+                    ));
                }
-                let query = args.get("query").and_then(|v| v.as_str()).ok_or("missing query")?;
+                let query = args
+                    .get("query")
+                    .and_then(|v| v.as_str())
+                    .ok_or("missing query")?;
                let search_engine = SearchEngine::new(&self.db);
                let _ = search_engine.setup_fts_tables().await;
-                let results = search_engine.search_messages(query).await.map_err(|e| e.to_string())?;
+                let results = search_engine
+                    .search_messages(query)
+                    .await
+                    .map_err(|e| e.to_string())?;

                let sanitized: Vec<_> = results
                    .into_iter()
@@ -384,10 +426,18 @@ impl McpToolHandler {
                Ok(json!({ "results": sanitized }))
            }
            "nuncio_cal_list_events" => {
-                if !self.policy.is_data_type_allowed(DataType::Calendar) || !self.policy.permissions.read_calendar {
-                    return Err(format!("403 Forbidden: Agent '{}' lacks 'read_calendar' permission", self.policy.agent_id));
+                if !self.policy.is_data_type_allowed(DataType::Calendar)
+                    || !self.policy.permissions.read_calendar
+                {
+                    return Err(format!(
+                        "403 Forbidden: Agent '{}' lacks 'read_calendar' permission",
+                        self.policy.agent_id
+                    ));
                }
-                let calendar_id = args.get("calendar_id").and_then(|v| v.as_str()).unwrap_or("work");
+                let calendar_id = args
+                    .get("calendar_id")
+                    .and_then(|v| v.as_str())
+                    .unwrap_or("work");
                #[allow(clippy::type_complexity)]
                let rows: Vec<(String, String, String, String, i64, i64, Option<String>)> = sqlx::query_as(
                    "SELECT id, account_id, calendar_id, summary, start_time, end_time, location FROM calendar_events WHERE calendar_id = ?"
@@ -405,17 +455,40 @@ impl McpToolHandler {
                Ok(json!({ "events": filtered }))
            }
            "nuncio_cal_create_event" => {
-                if !self.policy.is_data_type_allowed(DataType::Calendar) || !self.policy.permissions.write_calendar {
-                    return Err(format!("403 Forbidden: Agent '{}' lacks 'write_calendar' permission", self.policy.agent_id));
+                if !self.policy.is_data_type_allowed(DataType::Calendar)
+                    || !self.policy.permissions.write_calendar
+                {
+                    return Err(format!(
+                        "403 Forbidden: Agent '{}' lacks 'write_calendar' permission",
+                        self.policy.agent_id
+                    ));
                }
-                let account_id = args.get("account_id").and_then(|v| v.as_str()).unwrap_or("acct-1");
+                let account_id = args
+                    .get("account_id")
+                    .and_then(|v| v.as_str())
+                    .unwrap_or("acct-1");
                if !self.policy.is_account_allowed(account_id) {
-                    return Err(format!("403 Forbidden: Agent '{}' is restricted from account '{}'", self.policy.agent_id, account_id));
+                    return Err(format!(
+                        "403 Forbidden: Agent '{}' is restricted from account '{}'",
+                        self.policy.agent_id, account_id
+                    ));
                }
-                let calendar_id = args.get("calendar_id").and_then(|v| v.as_str()).ok_or("missing calendar_id")?;
-                let summary = args.get("summary").and_then(|v| v.as_str()).ok_or("missing summary")?;
-                let start_time = args.get("start_time").and_then(|v| v.as_i64()).ok_or("missing start_time")?;
-                let end_time = args.get("end_time").and_then(|v| v.as_i64()).ok_or("missing end_time")?;
+                let calendar_id = args
+                    .get("calendar_id")
+                    .and_then(|v| v.as_str())
+                    .ok_or("missing calendar_id")?;
+                let summary = args
+                    .get("summary")
+                    .and_then(|v| v.as_str())
+                    .ok_or("missing summary")?;
+                let start_time = args
+                    .get("start_time")
+                    .and_then(|v| v.as_i64())
+                    .ok_or("missing start_time")?;
+                let end_time = args
+                    .get("end_time")
+                    .and_then(|v| v.as_i64())
+                    .ok_or("missing end_time")?;

                let event = CalendarEvent {
                    id: format!("mcp-evt-{}", chrono::Utc::now().timestamp_millis()),
@@ -448,7 +521,10 @@ impl McpToolHandler {
            }
            "nuncio_account_list" => {
                if !self.policy.is_data_type_allowed(DataType::Mail) {
-                    return Err(format!("403 Forbidden: Agent '{}' lacks access to account list", self.policy.agent_id));
+                    return Err(format!(
+                        "403 Forbidden: Agent '{}' lacks access to account list",
+                        self.policy.agent_id
+                    ));
                }
                let accounts = self.db.list_accounts().await.map_err(|e| e.to_string())?;
                let filtered: Vec<_> = accounts
@@ -458,9 +534,18 @@ impl McpToolHandler {
                Ok(json!({ "accounts": filtered }))
            }
            "nuncio_account_add" => {
-                let email = args.get("email").and_then(|v| v.as_str()).ok_or("missing email")?;
-                let imap_host = args.get("imap_host").and_then(|v| v.as_str()).ok_or("missing imap_host")?;
-                let imap_port = args.get("imap_port").and_then(|v| v.as_u64()).unwrap_or(993) as u16;
+                let email = args
+                    .get("email")
+                    .and_then(|v| v.as_str())
+                    .ok_or("missing email")?;
+                let imap_host = args
+                    .get("imap_host")
+                    .and_then(|v| v.as_str())
+                    .ok_or("missing imap_host")?;
+                let imap_port = args
+                    .get("imap_port")
+                    .and_then(|v| v.as_u64())
+                    .unwrap_or(993) as u16;

                let acct = nuncio_core::AccountConfig {
                    id: format!("acct-{}", chrono::Utc::now().timestamp_millis()),
@@ -480,80 +565,147 @@ impl McpToolHandler {
                Ok(json!({ "status": "created", "account": acct }))
            }
            "nuncio_account_edit" => {
-                let account_id = args.get("account_id").and_then(|v| v.as_str()).ok_or("missing account_id")?;
+                let account_id = args
+                    .get("account_id")
+                    .and_then(|v| v.as_str())
+                    .ok_or("missing account_id")?;
                let email = args.get("email").and_then(|v| v.as_str());
                Ok(json!({ "status": "updated", "account_id": account_id, "updated_email": email }))
            }
            "nuncio_account_delete" => {
-                let account_id = args.get("account_id").and_then(|v| v.as_str()).ok_or("missing account_id")?;
+                let account_id = args
+                    .get("account_id")
+                    .and_then(|v| v.as_str())
+                    .ok_or("missing account_id")?;
                Ok(json!({ "status": "deleted", "account_id": account_id }))
            }
            "nuncio_account_test" => {
-                let account_id = args.get("account_id").and_then(|v| v.as_str()).ok_or("missing account_id")?;
+                let account_id = args
+                    .get("account_id")
+                    .and_then(|v| v.as_str())
+                    .ok_or("missing account_id")?;
                Ok(json!({ "status": "ok", "account_id": account_id, "latency_ms": 24 }))
            }
-            "nuncio_licenses" => {
-                Ok(json!({
-                    "licenses": [
-                        { "name": "tokio", "license": "MIT", "description": "Asynchronous runtime engine" },
-                        { "name": "ratatui", "license": "MIT", "description": "Terminal UI rendering engine" },
-                        { "name": "tauri", "license": "MIT/Apache-2.0", "description": "Desktop WebView shell" },
-                        { "name": "sqlx", "license": "MIT/Apache-2.0", "description": "Async SQLite database driver" },
-                        { "name": "lettre", "license": "MIT", "description": "SMTP transport client" },
-                        { "name": "async-imap", "license": "MIT/Apache-2.0", "description": "Async IMAP protocol client" },
-                        { "name": "aes-gcm", "license": "MIT/Apache-2.0", "description": "AES-256-GCM authenticated encryption" },
-                        { "name": "age", "license": "MIT/Apache-2.0", "description": "Attachment stream encryption cipher" },
-                        { "name": "zeroize", "license": "MIT/Apache-2.0", "description": "Secure memory wiping" },
-                        { "name": "keyring", "license": "MIT/Apache-2.0", "description": "OS key store integration" }
-                    ]
-                }))
-            }
+            "nuncio_licenses" => Ok(json!({
+                "licenses": [
+                    { "name": "tokio", "license": "MIT", "description": "Asynchronous runtime engine" },
+                    { "name": "ratatui", "license": "MIT", "description": "Terminal UI rendering engine" },
+                    { "name": "tauri", "license": "MIT/Apache-2.0", "description": "Desktop WebView shell" },
+                    { "name": "sqlx", "license": "MIT/Apache-2.0", "description": "Async SQLite database driver" },
+                    { "name": "lettre", "license": "MIT", "description": "SMTP transport client" },
+                    { "name": "async-imap", "license": "MIT/Apache-2.0", "description": "Async IMAP protocol client" },
+                    { "name": "aes-gcm", "license": "MIT/Apache-2.0", "description": "AES-256-GCM authenticated encryption" },
+                    { "name": "age", "license": "MIT/Apache-2.0", "description": "Attachment stream encryption cipher" },
+                    { "name": "zeroize", "license": "MIT/Apache-2.0", "description": "Secure memory wiping" },
+                    { "name": "keyring", "license": "MIT/Apache-2.0", "description": "OS key store integration" }
+                ]
+            })),
            "nuncio_filter_list" => {
-                if !self.policy.is_data_type_allowed(DataType::FilterRules) || !self.policy.permissions.manage_filters {
-                    return Err(format!("403 Forbidden: Agent '{}' lacks 'manage_filters' permission", self.policy.agent_id));
+                if !self.policy.is_data_type_allowed(DataType::FilterRules)
+                    || !self.policy.permissions.manage_filters
+                {
+                    return Err(format!(
+                        "403 Forbidden: Agent '{}' lacks 'manage_filters' permission",
+                        self.policy.agent_id
+                    ));
                }
-                let rules = self.db.list_filter_rules().await.map_err(|e| e.to_string())?;
+                let rules = self
+                    .db
+                    .list_filter_rules()
+                    .await
+                    .map_err(|e| e.to_string())?;
                Ok(json!({ "rules": rules }))
            }
            "nuncio_filter_create" => {
-                if !self.policy.is_data_type_allowed(DataType::FilterRules) || !self.policy.permissions.manage_filters {
-                    return Err(format!("403 Forbidden: Agent '{}' lacks 'manage_filters' permission", self.policy.agent_id));
+                if !self.policy.is_data_type_allowed(DataType::FilterRules)
+                    || !self.policy.permissions.manage_filters
+                {
+                    return Err(format!(
+                        "403 Forbidden: Agent '{}' lacks 'manage_filters' permission",
+                        self.policy.agent_id
+                    ));
                }
-                let name = args.get("name").and_then(|v| v.as_str()).ok_or("missing name")?;
-                let sql = args.get("sql").and_then(|v| v.as_str()).ok_or("missing sql")?;
+                let name = args
+                    .get("name")
+                    .and_then(|v| v.as_str())
+                    .ok_or("missing name")?;
+                let sql = args
+                    .get("sql")
+                    .and_then(|v| v.as_str())
+                    .ok_or("missing sql")?;
                let priority = args.get("priority").and_then(|v| v.as_i64()).unwrap_or(0) as i32;

-                let rule = nuncio_filter::NsqlParser::parse_rule(name, priority, sql).map_err(|e| e.to_string())?;
+                let rule = nuncio_filter::NsqlParser::parse_rule(name, priority, sql)
+                    .map_err(|e| e.to_string())?;
                let opts = nuncio_filter::ValidationOptions::default();
                nuncio_filter::NsqlValidator::validate(&rule, &opts).map_err(|e| e.to_string())?;
-                self.db.save_filter_rule(&rule).await.map_err(|e| e.to_string())?;
+                self.db
+                    .save_filter_rule(&rule)
+                    .await
+                    .map_err(|e| e.to_string())?;
                Ok(json!({ "status": "created", "rule": rule }))
            }
            "nuncio_filter_edit" => {
-                let id = args.get("id").and_then(|v| v.as_str()).ok_or("missing id")?;
-                let rules = self.db.list_filter_rules().await.map_err(|e| e.to_string())?;
-                let existing = rules.into_iter().find(|r| r.id == id).ok_or("rule not found")?;
+                let id = args
+                    .get("id")
+                    .and_then(|v| v.as_str())
+                    .ok_or("missing id")?;
+                let rules = self
+                    .db
+                    .list_filter_rules()
+                    .await
+                    .map_err(|e| e.to_string())?;
+                let existing = rules
+                    .into_iter()
+                    .find(|r| r.id == id)
+                    .ok_or("rule not found")?;

-                let name = args.get("name").and_then(|v| v.as_str()).unwrap_or(&existing.name);
-                let sql = args.get("sql").and_then(|v| v.as_str()).unwrap_or(&existing.nsql_text);
-                let priority = args.get("priority").and_then(|v| v.as_i64()).map(|p| p as i32).unwrap_or(existing.priority);
+                let name = args
+                    .get("name")
+                    .and_then(|v| v.as_str())
+                    .unwrap_or(&existing.name);
+                let sql = args
+                    .get("sql")
+                    .and_then(|v| v.as_str())
+                    .unwrap_or(&existing.nsql_text);
+                let priority = args
+                    .get("priority")
+                    .and_then(|v| v.as_i64())
+                    .map(|p| p as i32)
+                    .unwrap_or(existing.priority);

-                let mut updated = nuncio_filter::NsqlParser::parse_rule(name, priority, sql).map_err(|e| e.to_string())?;
+                let mut updated = nuncio_filter::NsqlParser::parse_rule(name, priority, sql)
+                    .map_err(|e| e.to_string())?;
                updated.id = id.to_string();
                let opts = nuncio_filter::ValidationOptions::default();
-                nuncio_filter::NsqlValidator::validate(&updated, &opts).map_err(|e| e.to_string())?;
-                self.db.save_filter_rule(&updated).await.map_err(|e| e.to_string())?;
+                nuncio_filter::NsqlValidator::validate(&updated, &opts)
+                    .map_err(|e| e.to_string())?;
+                self.db
+                    .save_filter_rule(&updated)
+                    .await
+                    .map_err(|e| e.to_string())?;
                Ok(json!({ "status": "updated", "rule": updated }))
            }
            "nuncio_filter_delete" => {
-                let id = args.get("id").and_then(|v| v.as_str()).ok_or("missing id")?;
-                self.db.delete_filter_rule(id).await.map_err(|e| e.to_string())?;
+                let id = args
+                    .get("id")
+                    .and_then(|v| v.as_str())
+                    .ok_or("missing id")?;
+                self.db
+                    .delete_filter_rule(id)
+                    .await
+                    .map_err(|e| e.to_string())?;
                Ok(json!({ "status": "deleted", "id": id }))
            }
            "nuncio_filter_test" => {
-                let sql = args.get("sql").and_then(|v| v.as_str()).ok_or("missing sql")?;
-                let rule = nuncio_filter::NsqlParser::parse_rule("Test Rule", 0, sql).map_err(|e| e.to_string())?;
-                let engine = nuncio_filter::FilterEngine::new(vec![rule]).map_err(|e| e.to_string())?;
+                let sql = args
+                    .get("sql")
+                    .and_then(|v| v.as_str())
+                    .ok_or("missing sql")?;
+                let rule = nuncio_filter::NsqlParser::parse_rule("Test Rule", 0, sql)
+                    .map_err(|e| e.to_string())?;
+                let engine =
+                    nuncio_filter::FilterEngine::new(vec![rule]).map_err(|e| e.to_string())?;
                let sample_email = Email {
                    id: "mcp-test-email".to_string(),
                    account_id: "acct-1".to_string(),
@@ -572,7 +724,11 @@ impl McpToolHandler {
            }
            "nuncio_filter_logs" => {
                let limit = args.get("limit").and_then(|v| v.as_u64()).unwrap_or(50) as usize;
-                let logs = self.db.list_filter_execution_logs(limit).await.map_err(|e| e.to_string())?;
+                let logs = self
+                    .db
+                    .list_filter_execution_logs(limit)
+                    .await
+                    .map_err(|e| e.to_string())?;
                Ok(json!({ "logs": logs }))
            }
            "nuncio_update_check" => {
@@ -603,26 +759,53 @@ impl McpToolHandler {
            "nuncio_audit_list" => {
                let limit = args.get("limit").and_then(|v| v.as_u64()).unwrap_or(50) as u32;
                let offset = args.get("offset").and_then(|v| v.as_u64()).unwrap_or(0) as u32;
-                let records = self.db.list_worm_audit_records(limit, offset).await.map_err(|e| e.to_string())?;
+                let records = self
+                    .db
+                    .list_worm_audit_records(limit, offset)
+                    .await
+                    .map_err(|e| e.to_string())?;
                Ok(json!({ "records": records }))
            }
            "nuncio_audit_verify" => {
-                let is_valid = self.db.verify_worm_audit_chain(nuncio_core::DEFAULT_WORM_KEY).await.is_ok();
+                let is_valid = self.db.verify_worm_audit_chain().await.is_ok();
                Ok(json!({ "status": "verified", "chain_integrity_valid": is_valid }))
            }
            "nuncio_export_data" => {
-                if !self.policy.is_data_type_allowed(DataType::Mail) || !self.policy.permissions.read_mail {
-                    return Err(format!("403 Forbidden: Agent '{}' lacks 'read_mail' permission for data export", self.policy.agent_id));
+                if !self.policy.is_data_type_allowed(DataType::Mail)
+                    || !self.policy.permissions.read_mail
+                {
+                    return Err(format!(
+                        "403 Forbidden: Agent '{}' lacks 'read_mail' permission for data export",
+                        self.policy.agent_id
+                    ));
                }
-                let output_str = args.get("output_path").and_then(|v| v.as_str()).ok_or("missing output_path")?;
-                let format_str = args.get("format").and_then(|v| v.as_str()).unwrap_or("mbox");
-                let folder_id = args.get("folder_id").and_then(|v| v.as_str()).unwrap_or("INBOX");
+                let output_str = args
+                    .get("output_path")
+                    .and_then(|v| v.as_str())
+                    .ok_or("missing output_path")?;
+                let format_str = args
+                    .get("format")
+                    .and_then(|v| v.as_str())
+                    .unwrap_or("mbox");
+                let folder_id = args
+                    .get("folder_id")
+                    .and_then(|v| v.as_str())
+                    .unwrap_or("INBOX");
                let limit = args.get("limit").and_then(|v| v.as_u64()).unwrap_or(1000) as usize;

-                let format: nuncio_core::ExportFormat = format_str.parse().map_err(|e: String| e)?;
-                let messages = self.db.list_messages(folder_id, limit).await.map_err(|e| e.to_string())?;
+                let format: nuncio_core::ExportFormat =
+                    format_str.parse().map_err(|e: String| e)?;
+                let messages = self
+                    .db
+                    .list_messages(folder_id, limit)
+                    .await
+                    .map_err(|e| e.to_string())?;

-                let summary = self.db.export_messages_to_file(&messages, format, std::path::Path::new(output_str)).await.map_err(|e| e.to_string())?;
+                let summary = self
+                    .db
+                    .export_messages_to_file(&messages, format, std::path::Path::new(output_str))
+                    .await
+                    .map_err(|e| e.to_string())?;
                Ok(json!({ "status": "exported", "summary": summary }))
            }
            _ => Err(format!("Unknown tool: {}", name)),
@@ -1,5 +1,7 @@
 //! Integration system test suite for nuncio-mcp JSON-RPC protocol server.

+#![allow(clippy::unwrap_used, clippy::expect_used, clippy::panic)]
+
 use nuncio_mcp::McpServer;

 #[tokio::test]
@@ -33,14 +35,26 @@ async fn system_test_mcp_protocol_initialize_tools_and_resources() {

    // 2b. Test Update Check & Apply Tools
    let check_req = r#"{"jsonrpc":"2.0","id":21,"method":"tools/call","params":{"name":"nuncio_update_check","arguments":{}}}"#;
-    let resp = server.handle_request_json(check_req).await.expect("update check response");
+    let resp = server
+        .handle_request_json(check_req)
+        .await
+        .expect("update check response");
    assert_eq!(resp["id"], 21);
-    assert!(resp["result"]["content"][0]["text"].as_str().unwrap().contains("update_available"));
+    assert!(resp["result"]["content"][0]["text"]
+        .as_str()
+        .unwrap()
+        .contains("update_available"));

    let apply_req = r#"{"jsonrpc":"2.0","id":22,"method":"tools/call","params":{"name":"nuncio_update_apply","arguments":{"version":"0.2.0"}}}"#;
-    let resp = server.handle_request_json(apply_req).await.expect("update apply response");
+    let resp = server
+        .handle_request_json(apply_req)
+        .await
+        .expect("update apply response");
    assert_eq!(resp["id"], 22);
-    assert!(resp["result"]["content"][0]["text"].as_str().unwrap().contains("update_initiated"));
+    assert!(resp["result"]["content"][0]["text"]
+        .as_str()
+        .unwrap()
+        .contains("update_initiated"));

    // 3. Tools Call (Create & List Calendar Event)
    let create_req = r#"{
@@ -10,11 +10,11 @@ repository.workspace = true
 workspace = true

 [dependencies]
-nuncio-core = { path = "../nuncio-core" }
-nuncio-mail = { path = "../nuncio-mail" }
-nuncio-cal = { path = "../nuncio-cal" }
-nuncio-store = { path = "../nuncio-store" }
-nuncio-filter = { path = "../nuncio-filter" }
+nuncio-core = { path = "../../crates/nuncio-core" }
+nuncio-mail = { path = "../../crates/nuncio-mail" }
+nuncio-cal = { path = "../../crates/nuncio-cal" }
+nuncio-store = { path = "../../crates/nuncio-store" }
+nuncio-filter = { path = "../../crates/nuncio-filter" }

 tokio.workspace = true
 ratatui.workspace = true
@@ -66,19 +66,25 @@ pub struct TuiApp {
 impl TuiApp {
    /// Create a new `TuiApp` wrapping an `EventBus`.
    pub fn new(event_bus: EventBus) -> Self {
-        let sample_rule1 = NsqlParser::parse_rule(
+        // Sample demo rules use fixed, known-valid NSQL text; if parsing ever
+        // fails (e.g. a future NSQL grammar change), fall back to no sample
+        // rules rather than panicking.
+        let mut sample_filter_rules = Vec::new();
+        if let Ok(sample_rule1) = NsqlParser::parse_rule(
            "Priority Boss Filter",
            0,
            "WHERE (from = 'boss@nuncio.mx' AND size > 1024) ACTION MOVE TO 'Priority', FLAG",
-        )
-        .expect("parse sample rule");
+        ) {
+            sample_filter_rules.push(sample_rule1);
+        }

-        let sample_rule2 = NsqlParser::parse_rule(
+        if let Ok(sample_rule2) = NsqlParser::parse_rule(
            "Spam Auto Cleaner",
            1,
            "WHERE folder IN ('spam', 'junk') ACTION DELETE",
-        )
-        .expect("parse sample rule");
+        ) {
+            sample_filter_rules.push(sample_rule2);
+        }

        Self {
            event_bus,
@@ -123,7 +129,7 @@ impl TuiApp {
            messages: Vec::new(),
            selected_message_idx: 0,

-            filter_rules: vec![sample_rule1, sample_rule2],
+            filter_rules: sample_filter_rules,
            selected_filter_idx: 0,
            filter_editor_mode: FilterEditorSubMode::VisualBuilder,
            filter_preview_active: false,
@@ -131,13 +137,18 @@ impl TuiApp {
            filter_logs_drawer_open: false,
            filter_logs: Vec::new(),
            recovery_banner: None,
-            update_banner: Some("[UPDATE AVAILABLE] Nuncio v0.2.0 is available — Press [u] to Update & Restart".to_string()),
+            update_banner: Some(
+                "[UPDATE AVAILABLE] Nuncio v0.2.0 is available — Press [u] to Update & Restart"
+                    .to_string(),
+            ),
        }
    }

    /// Trigger database recovery alert notification on top header menu.
    pub fn trigger_recovery_alert(&mut self, backup_path: &str) {
-        self.recovery_banner = Some(format!("[NOTICE] Database Auto-Healed ({backup_path}) — Resynchronizing Inbox..."));
+        self.recovery_banner = Some(format!(
+            "[NOTICE] Database Auto-Healed ({backup_path}) — Resynchronizing Inbox..."
+        ));
    }

    /// Trigger software update download and application workflow (`[u]`).
@@ -149,23 +160,29 @@ impl TuiApp {
    pub fn move_selection_down(&mut self) {
        match self.mode {
            AppMode::FilterRules => {
-                if !self.filter_rules.is_empty() && self.selected_filter_idx + 1 < self.filter_rules.len() {
+                if !self.filter_rules.is_empty()
+                    && self.selected_filter_idx + 1 < self.filter_rules.len()
+                {
                    self.selected_filter_idx += 1;
                }
            }
            AppMode::AccountSettings => {
-                if !self.accounts.is_empty() && self.selected_account_idx + 1 < self.accounts.len() {
+                if !self.accounts.is_empty() && self.selected_account_idx + 1 < self.accounts.len()
+                {
                    self.selected_account_idx += 1;
                }
            }
            AppMode::MainView => match self.active_pane {
                ActivePane::Sidebar => {
-                    if !self.folders.is_empty() && self.selected_folder_idx + 1 < self.folders.len() {
+                    if !self.folders.is_empty() && self.selected_folder_idx + 1 < self.folders.len()
+                    {
                        self.selected_folder_idx += 1;
                    }
                }
                ActivePane::MessageList => {
-                    if !self.messages.is_empty() && self.selected_message_idx + 1 < self.messages.len() {
+                    if !self.messages.is_empty()
+                        && self.selected_message_idx + 1 < self.messages.len()
+                    {
                        self.selected_message_idx += 1;
                    }
                }
@@ -208,7 +225,8 @@ impl TuiApp {
    /// Re-order rule priority up (`[K]`).
    pub fn reorder_filter_priority_up(&mut self) {
        if self.mode == AppMode::FilterRules && self.selected_filter_idx > 0 {
-            self.filter_rules.swap(self.selected_filter_idx, self.selected_filter_idx - 1);
+            self.filter_rules
+                .swap(self.selected_filter_idx, self.selected_filter_idx - 1);
            self.selected_filter_idx -= 1;
            for (idx, rule) in self.filter_rules.iter_mut().enumerate() {
                rule.priority = idx as i32;
@@ -218,8 +236,11 @@ impl TuiApp {

    /// Re-order rule priority down (`[J]`).
    pub fn reorder_filter_priority_down(&mut self) {
-        if self.mode == AppMode::FilterRules && self.selected_filter_idx + 1 < self.filter_rules.len() {
-            self.filter_rules.swap(self.selected_filter_idx, self.selected_filter_idx + 1);
+        if self.mode == AppMode::FilterRules
+            && self.selected_filter_idx + 1 < self.filter_rules.len()
+        {
+            self.filter_rules
+                .swap(self.selected_filter_idx, self.selected_filter_idx + 1);
            self.selected_filter_idx += 1;
            for (idx, rule) in self.filter_rules.iter_mut().enumerate() {
                rule.priority = idx as i32;
@@ -324,7 +345,8 @@ impl TuiApp {
                Color::Blue,
            )
        };
-        let header = Paragraph::new(header_text).style(Style::default().bg(bg_color).fg(Color::Black));
+        let header =
+            Paragraph::new(header_text).style(Style::default().bg(bg_color).fg(Color::Black));
        frame.render_widget(header, main_chunks[0]);

        // Render body area based on AppMode
@@ -341,7 +363,11 @@ impl TuiApp {
                    .iter()
                    .enumerate()
                    .map(|(idx, rule)| {
-                        let prefix = if idx == self.selected_filter_idx { " > " } else { "   " };
+                        let prefix = if idx == self.selected_filter_idx {
+                            " > "
+                        } else {
+                            "   "
+                        };
                        ListItem::new(format!("{}[P{}] {}", prefix, rule.priority, rule.name))
                    })
                    .collect();
@@ -355,19 +381,34 @@ impl TuiApp {
                // Right: Editor & Details Pane
                let mut right_text = String::new();
                if let Some(rule) = self.filter_rules.get(self.selected_filter_idx) {
-                    right_text.push_str(&format!("Rule ID: {}\nName: {}\nPriority: {}\n\n", rule.id, rule.name, rule.priority));
-                    right_text.push_str(&format!("Active Sub-Mode [s]: {:?}\n\n", self.filter_editor_mode));
+                    right_text.push_str(&format!(
+                        "Rule ID: {}\nName: {}\nPriority: {}\n\n",
+                        rule.id, rule.name, rule.priority
+                    ));
+                    right_text.push_str(&format!(
+                        "Active Sub-Mode [s]: {:?}\n\n",
+                        self.filter_editor_mode
+                    ));
                    right_text.push_str(&format!("NSQL Query:\n{}\n\n", rule.nsql_text));

                    if self.filter_preview_active {
-                        right_text.push_str("── DRY-RUN PREVIEW RESULTS [t] ───────────────────────\n");
+                        right_text
+                            .push_str("── DRY-RUN PREVIEW RESULTS [t] ───────────────────────\n");
                        if let Some(prev) = &self.filter_preview_result {
-                            right_text.push_str(&format!("Matched: {}\nMatched Rule: {:?}\nActions: {:?}\nTime: {}us\n", prev.matched, prev.matched_rule_name, prev.actions_evaluated, prev.execution_time_us));
+                            right_text.push_str(&format!(
+                                "Matched: {}\nMatched Rule: {:?}\nActions: {:?}\nTime: {}us\n",
+                                prev.matched,
+                                prev.matched_rule_name,
+                                prev.actions_evaluated,
+                                prev.execution_time_us
+                            ));
                        }
                    }

                    if self.filter_logs_drawer_open {
-                        right_text.push_str("\n── EXECUTION LOG DRAWER [l] ───────────────────────────\n");
+                        right_text.push_str(
+                            "\n── EXECUTION LOG DRAWER [l] ───────────────────────────\n",
+                        );
                        right_text.push_str("Log chain verified OK (Genesis hash linked).\n");
                    }
                }
@@ -470,7 +511,10 @@ impl TuiApp {
                let sidebar_block = Block::default()
                    .title(" Folders (20%) ")
                    .borders(Borders::ALL)
-                    .border_style(AppLayout::border_style(ActivePane::Sidebar, self.active_pane));
+                    .border_style(AppLayout::border_style(
+                        ActivePane::Sidebar,
+                        self.active_pane,
+                    ));
                let sidebar_list = List::new(sidebar_items).block(sidebar_block);
                frame.render_widget(sidebar_list, sidebar_area);

@@ -486,14 +530,18 @@ impl TuiApp {
                            "   "
                        };
                        let status = if msg.read { " " } else { "●" };
-                        let text = format!("{} {} {:<15} {}", prefix, status, msg.sender, msg.subject);
+                        let text =
+                            format!("{} {} {:<15} {}", prefix, status, msg.sender, msg.subject);
                        ListItem::new(text)
                    })
                    .collect();
                let msg_block = Block::default()
                    .title(" Messages (35%) ")
                    .borders(Borders::ALL)
-                    .border_style(AppLayout::border_style(ActivePane::MessageList, self.active_pane));
+                    .border_style(AppLayout::border_style(
+                        ActivePane::MessageList,
+                        self.active_pane,
+                    ));
                let msg_list = List::new(msg_items).block(msg_block);
                frame.render_widget(msg_list, list_area);

@@ -508,7 +556,10 @@ impl TuiApp {
                let reader_block = Block::default()
                    .title(" Email Reader (45%) ")
                    .borders(Borders::ALL)
-                    .border_style(AppLayout::border_style(ActivePane::Reader, self.active_pane));
+                    .border_style(AppLayout::border_style(
+                        ActivePane::Reader,
+                        self.active_pane,
+                    ));
                let reader_p = Paragraph::new(body_text).block(reader_block);
                frame.render_widget(reader_p, reader_area);
            }
@@ -516,7 +567,8 @@ impl TuiApp {

        // Footer navigation bar
        let footer_text = " [?] Help │ [f] Filter Rules │ [a] Accounts │ [u] Update │ [s] Sync │ [c] Compose │ [r] Reply │ [q] Quit ";
-        let footer = Paragraph::new(footer_text).style(Style::default().bg(Color::DarkGray).fg(Color::White));
+        let footer = Paragraph::new(footer_text)
+            .style(Style::default().bg(Color::DarkGray).fg(Color::White));
        frame.render_widget(footer, main_chunks[2]);
    }
 }
@@ -187,24 +187,48 @@ mod tests {
        let mut sm = VimLeaderStateMachine::new();

        // Single 'g' puts state machine in PendingG
-        assert_eq!(sm.process_key(make_key(KeyCode::Char('g'), KeyModifiers::NONE)), UserAction::None);
+        assert_eq!(
+            sm.process_key(make_key(KeyCode::Char('g'), KeyModifiers::NONE)),
+            UserAction::None
+        );
        assert_eq!(sm.state(), LeaderState::PendingG);

        // 'g' + 'g' -> JumpTop
-        assert_eq!(sm.process_key(make_key(KeyCode::Char('g'), KeyModifiers::NONE)), UserAction::JumpTop);
+        assert_eq!(
+            sm.process_key(make_key(KeyCode::Char('g'), KeyModifiers::NONE)),
+            UserAction::JumpTop
+        );
        assert_eq!(sm.state(), LeaderState::Idle);

        // 'g' + 'i' -> JumpInbox
-        assert_eq!(sm.process_key(make_key(KeyCode::Char('g'), KeyModifiers::NONE)), UserAction::None);
-        assert_eq!(sm.process_key(make_key(KeyCode::Char('i'), KeyModifiers::NONE)), UserAction::JumpInbox);
+        assert_eq!(
+            sm.process_key(make_key(KeyCode::Char('g'), KeyModifiers::NONE)),
+            UserAction::None
+        );
+        assert_eq!(
+            sm.process_key(make_key(KeyCode::Char('i'), KeyModifiers::NONE)),
+            UserAction::JumpInbox
+        );

        // 'g' + 's' -> JumpSent
-        assert_eq!(sm.process_key(make_key(KeyCode::Char('g'), KeyModifiers::NONE)), UserAction::None);
-        assert_eq!(sm.process_key(make_key(KeyCode::Char('s'), KeyModifiers::NONE)), UserAction::JumpSent);
+        assert_eq!(
+            sm.process_key(make_key(KeyCode::Char('g'), KeyModifiers::NONE)),
+            UserAction::None
+        );
+        assert_eq!(
+            sm.process_key(make_key(KeyCode::Char('s'), KeyModifiers::NONE)),
+            UserAction::JumpSent
+        );

        // 'g' + 'a' -> JumpArchive
-        assert_eq!(sm.process_key(make_key(KeyCode::Char('g'), KeyModifiers::NONE)), UserAction::None);
-        assert_eq!(sm.process_key(make_key(KeyCode::Char('a'), KeyModifiers::NONE)), UserAction::JumpArchive);
+        assert_eq!(
+            sm.process_key(make_key(KeyCode::Char('g'), KeyModifiers::NONE)),
+            UserAction::None
+        );
+        assert_eq!(
+            sm.process_key(make_key(KeyCode::Char('a'), KeyModifiers::NONE)),
+            UserAction::JumpArchive
+        );
    }

    #[test]
@@ -1,5 +1,7 @@
 //! Nuncio Terminal UI library.

+#![cfg_attr(test, allow(clippy::unwrap_used, clippy::expect_used, clippy::panic))]
+
 pub mod app;
 pub mod html;
 pub mod keybindings;
@@ -1,5 +1,7 @@
 //! E2E System Test Suite for nuncio-tui.

+#![allow(clippy::unwrap_used, clippy::expect_used, clippy::panic)]
+
 use nuncio_core::EventBus;
 use nuncio_tui::{ActivePane, AppMode, TuiApp};
 use ratatui::backend::TestBackend;
@@ -2,6 +2,8 @@
 //! Renders Ratatui interface onto TestBackend, simulates keyboard navigation,
 //! and verifies terminal buffer visual text snapshot representations.

+#![allow(clippy::unwrap_used, clippy::expect_used, clippy::panic)]
+
 use nuncio_core::{CoreEvent, EventBus};
 use nuncio_tui::{ActivePane, AppMode, TuiApp};
 use ratatui::backend::TestBackend;
@@ -35,7 +37,9 @@ async fn automated_tui_visual_and_keyboard_interaction_matrix() {
    // ------------------------------------------------------------------------
    // Step 1: Initial Render & Visual Snapshot Verification (Main 3-Pane View)
    // ------------------------------------------------------------------------
-    terminal.draw(|f| app.render_frame(f)).expect("render frame");
+    terminal
+        .draw(|f| app.render_frame(f))
+        .expect("render frame");
    let snapshot_main = buffer_to_snapshot(terminal.backend().buffer());

    // Verify brand header and main pane borders exist in visual snapshot
@@ -49,27 +53,38 @@ async fn automated_tui_visual_and_keyboard_interaction_matrix() {

    // Simulate Tab / 'l' to focus Message List
    app.set_active_pane(ActivePane::MessageList);
-    terminal.draw(|f| app.render_frame(f)).expect("render list frame");
+    terminal
+        .draw(|f| app.render_frame(f))
+        .expect("render list frame");
    assert_eq!(app.active_pane(), ActivePane::MessageList);

    // Simulate Tab / 'l' to focus Reader
    app.set_active_pane(ActivePane::Reader);
-    terminal.draw(|f| app.render_frame(f)).expect("render reader frame");
+    terminal
+        .draw(|f| app.render_frame(f))
+        .expect("render reader frame");
    assert_eq!(app.active_pane(), ActivePane::Reader);

    // ------------------------------------------------------------------------
    // Step 3: Event Stream Interaction - CoreEvent::SyncStarted Push Update
    // ------------------------------------------------------------------------
-    let evt = core_events_rx.recv().await.expect("receive published core event");
+    let evt = core_events_rx
+        .recv()
+        .await
+        .expect("receive published core event");
    assert!(matches!(evt, CoreEvent::SyncStarted { .. }));

-    terminal.draw(|f| app.render_frame(f)).expect("render syncing frame");
+    terminal
+        .draw(|f| app.render_frame(f))
+        .expect("render syncing frame");

    // ------------------------------------------------------------------------
    // Step 4: Modal Navigation - Help Overlay Visual Snapshot
    // ------------------------------------------------------------------------
    app.set_mode(AppMode::HelpModal);
-    terminal.draw(|f| app.render_frame(f)).expect("render help modal");
+    terminal
+        .draw(|f| app.render_frame(f))
+        .expect("render help modal");
    let snapshot_help = buffer_to_snapshot(terminal.backend().buffer());

    assert!(snapshot_help.contains("NUNCIO TUI KEYBINDINGS HELP"));
@@ -80,7 +95,9 @@ async fn automated_tui_visual_and_keyboard_interaction_matrix() {
    // Step 5: Modal Navigation - Account Settings Visual Snapshot
    // ------------------------------------------------------------------------
    app.set_mode(AppMode::AccountSettings);
-    terminal.draw(|f| app.render_frame(f)).expect("render account settings");
+    terminal
+        .draw(|f| app.render_frame(f))
+        .expect("render account settings");
    let snapshot_accounts = buffer_to_snapshot(terminal.backend().buffer());

    assert!(snapshot_accounts.contains("Account Settings"));
@@ -90,7 +107,9 @@ async fn automated_tui_visual_and_keyboard_interaction_matrix() {
    // Step 6: Modal Navigation - Splash Screen Visual Snapshot
    // ------------------------------------------------------------------------
    app.set_mode(AppMode::SplashScreen);
-    terminal.draw(|f| app.render_frame(f)).expect("render splash screen");
+    terminal
+        .draw(|f| app.render_frame(f))
+        .expect("render splash screen");
    let snapshot_splash = buffer_to_snapshot(terminal.backend().buffer());

    assert!(snapshot_splash.contains("Welcome to Nuncio"));
@@ -1 +0,0 @@
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Calendar Servers</text><text x="577.3" y="316.392" fill="#FFF" font-size="14" textLength="183.668" font-family="'Arial'">(IMAP/SMTP/JMAP/CalDAV)</text></g><!--link User to Daemon--><g class="link" data-entity-1="ent0001" data-entity-2="ent0002" id="lnk6" data-source-line="11" data-link-type="dependency"><path d="M404.28,87.28 C404.28,112.28 404.28,133.97 404.28,153.33" style="stroke:#181818;stroke-width:1;" fill="none" id="User-Daemon"/><polygon points="404.28,82.28,400.28,91.28,404.28,87.28,408.28,91.28,404.28,82.28" fill="#181818" style="strokeLine truncated
@@ -1 +0,0 @@
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fill="#FFF" font-size="14" textLength="192.356" font-family="'Arial'">Interface (CLI/TUI/GUI/MCP)</text><ellipse cx="109.178" cy="362.156" rx="8" ry="8" fill="#38BDF8" style="stroke:#181818;stroke-width:0.5;"/><path d="M109.178,370.156 L109.178,397.156 M96.178,378.156 L122.178,378.156 M109.178,397.156 L96.178,412.156 M109.178,397.156 L122.178,412.156" style="stroke:#181818;stroke-width:0.5;" fill="none"/><rect x="439.029" y="337.359" width="133.157" height="30.297" fill="#059669" style="stroke:#181818;stroke-width:0.5;" rx="2.5" ry="2.5"/><text x="446.029" y="357.354" fill="#FFF" font-size="14" textLength="119.157" font-family="'Arial'">nunciod Daemon</text><text x="853.375" y="350.354" fill="#FFF" font-size="14" textLength="140.595" font-family="'Arial'">SQLite WAL Storage</text><path d="M908.673,363.656 C908.673,353.656 926.673,353.656 926.673,353.656 C926.673,353.656 944.673,353.656 944.673,363.656 L944.673,389.656 C944.673,399.656 926.673,399.656 926.673,399.656 C926.673,399.656 908.673,399.656 908.673,389.656 L908.673,363.656" style="stroke:#181818;stroke-width:0.5;" fill="#6366F1"/><path d="M908.673,363.656 C908.673,373.656 926.673,373.656 926.673,373.656 C926.673,373.656 944.673,373.656 944.673,363.656" style="stroke:#181818;stroke-width:0.5;" fill="none"/><text x="1009.97" y="350.354" fill="#FFF" font-size="14" textLength="182.629" font-family="'Arial'">Remote IMAP/JMAP Server</text><ellipse cx="1104.285" cy="369.656" rx="12" ry="12" fill="#EC4899" style="stroke:#181818;stroke-width:0.5;"/><line x1="1092.285" y1="383.656" x2="1116.285" y2="383.656" style="stroke:#181818;stroke-width:0.5;"/><polygon points="493.608,111.43,503.608,115.43,493.608,119.43,497.608,115.43" fill="#181818" style="stroke:#181818;stroke-width:1;stroke-linejoin:miter;stroke-miterlimit:10;"/><line x1="109.178" y1="115.43" x2="499.608" y2="115.43" style="stroke:#181818;stroke-width:1;"/><text x="230.736" y="110.364" fill="#FFF" font-size="13" textLength="153.315" 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@@ -1 +1 @@
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data-entity-1="ent0006" data-entity-2="ent0008" id="lnkLine truncated
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@@ -0,0 +1,24 @@
+//! Protocol-agnostic async calendar backend trait definitions.
+
+use async_trait::async_trait;
+use nuncio_core::model::CalendarEvent;
+
+use crate::parser::CalendarError;
+
+/// Protocol-agnostic calendar backend engine trait implemented by CalDAV and mock engines.
+///
+/// Mirrors `nuncio_mail::MailBackend`'s shape: `Send + Sync` so implementations can be held
+/// behind an `Arc` and shared across daemon tasks, and returning the crate's single
+/// [`CalendarError`] type so callers do not need to know whether a given implementation talks
+/// to a real server or an in-memory fixture.
+#[async_trait]
+pub trait CalendarBackend: Send + Sync {
+    /// Fetch events belonging to `calendar_id` whose window overlaps
+    /// `[start_window, end_window]` (inclusive, unix seconds).
+    async fn fetch_events(
+        &self,
+        calendar_id: &str,
+        start_window: i64,
+        end_window: i64,
+    ) -> Result<Vec<CalendarEvent>, CalendarError>;
+}
@@ -1,19 +1,46 @@
 //! CalDAV (RFC 4791) / WebDAV REPORT client and XML query generator.

+use async_trait::async_trait;
 use nuncio_core::model::CalendarEvent;
+use serde::{Deserialize, Serialize};

+use crate::backend::CalendarBackend;
 use crate::parser::{CalendarError, IcalParserAdapter};

-/// CalDAV client protocol engine managing WebDAV REPORT queries.
+/// Configuration for a specific CalDAV calendar collection endpoint, mirroring
+/// `nuncio_contacts::CardDavAccountConfig`.
+///
+/// `caldav_url` must already resolve to a specific calendar collection (e.g.
+/// `https://caldav.example.com/dav/calendars/user/jmaes/work/`) -- PROPFIND-based
+/// `calendar-home-set` auto-discovery is out of scope for this client.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct CalDavAccountConfig {
+    /// Nuncio account identifier this calendar collection belongs to.
+    pub account_id: String,
+    /// Fully-qualified URL of the CalDAV calendar collection to query.
+    pub caldav_url: String,
+    /// Basic-auth username (or app-specific username, per provider).
+    pub username: String,
+    /// Basic-auth secret (password or app-specific token) resolved from the OS keyring by the
+    /// caller -- never stored anywhere else in plaintext.
+    pub auth_token: String,
+}
+
+/// CalDAV client protocol engine managing WebDAV REPORT queries against a real server.
 pub struct CalDavClient {
-    account_id: String,
+    config: CalDavAccountConfig,
+    http: reqwest::Client,
 }

 impl CalDavClient {
-    /// Create a new `CalDavClient` bound to an account ID.
-    pub fn new(account_id: &str) -> Self {
+    /// Create a new `CalDavClient` bound to a specific CalDAV calendar collection.
+    pub fn new(config: CalDavAccountConfig) -> Self {
        Self {
-            account_id: account_id.to_string(),
+            http: reqwest::Client::builder()
+                .user_agent("Nuncio-Calendar-CalDAV/1.0")
+                .build()
+                .unwrap_or_default(),
+            config,
        }
    }

@@ -54,7 +81,7 @@ impl CalDavClient {
                    let event_id = format!("caldav-evt-{}", events.len() + 1);
                    if let Ok(event) = IcalParserAdapter::parse_ical(
                        &event_id,
-                        &self.account_id,
+                        &self.config.account_id,
                        calendar_id,
                        clean_ics,
                    ) {
@@ -66,12 +93,96 @@ impl CalDavClient {

        Ok(events)
    }
+
+    /// Format a unix timestamp as the `YYYYMMDDTHHMMSSZ` form RFC 4791's
+    /// `<c:time-range>` filter expects.
+    fn format_query_timestamp(unix_seconds: i64) -> Result<String, CalendarError> {
+        chrono::DateTime::from_timestamp(unix_seconds, 0)
+            .map(|dt| dt.format("%Y%m%dT%H%M%SZ").to_string())
+            .ok_or_else(|| {
+                CalendarError::ParseFailed(format!(
+                    "invalid unix timestamp for CalDAV time-range window: {unix_seconds}"
+                ))
+            })
+    }
+
+    /// Issue a live CalDAV `REPORT` calendar-query (RFC 4791 Section 7.8) against
+    /// `self.config.caldav_url` and parse the `multistatus` response into domain events.
+    ///
+    /// This performs a real network request -- no canned or fabricated data is ever
+    /// returned. A server or network failure surfaces as [`CalendarError::TransportFailed`];
+    /// a malformed TZID inside a returned VEVENT surfaces as
+    /// [`CalendarError::UnresolvableTimezone`] via [`IcalParserAdapter::parse_ical`].
+    pub async fn fetch_remote_events(
+        &self,
+        calendar_id: &str,
+        start_window: i64,
+        end_window: i64,
+    ) -> Result<Vec<CalendarEvent>, CalendarError> {
+        let start_iso = Self::format_query_timestamp(start_window)?;
+        let end_iso = Self::format_query_timestamp(end_window)?;
+        let body = Self::build_report_query(&start_iso, &end_iso);
+
+        // "REPORT" is a fixed, always-valid HTTP token; `from_bytes` cannot fail for it, but
+        // the error is still propagated rather than unwrapped so no code path here can panic.
+        let report_method = reqwest::Method::from_bytes(b"REPORT")
+            .map_err(|e| CalendarError::TransportFailed(format!("invalid HTTP method: {e}")))?;
+
+        let response = self
+            .http
+            .request(report_method, &self.config.caldav_url)
+            .header("Content-Type", "application/xml; charset=utf-8")
+            .header("Depth", "1")
+            .basic_auth(&self.config.username, Some(&self.config.auth_token))
+            .body(body)
+            .send()
+            .await
+            .map_err(|e| CalendarError::TransportFailed(e.to_string()))?;
+
+        let status = response.status();
+        // RFC 4791 REPORT responses are conventionally 207 Multi-Status; some servers reply
+        // 200 OK for a single-collection result, so any 2xx/207 status is accepted.
+        if status.as_u16() != 207 && !status.is_success() {
+            return Err(CalendarError::TransportFailed(format!(
+                "CalDAV server returned unexpected status {status}"
+            )));
+        }
+
+        let raw_xml = response
+            .text()
+            .await
+            .map_err(|e| CalendarError::TransportFailed(e.to_string()))?;
+
+        self.parse_multistatus_response(calendar_id, &raw_xml)
+    }
+}
+
+#[async_trait]
+impl CalendarBackend for CalDavClient {
+    async fn fetch_events(
+        &self,
+        calendar_id: &str,
+        start_window: i64,
+        end_window: i64,
+    ) -> Result<Vec<CalendarEvent>, CalendarError> {
+        self.fetch_remote_events(calendar_id, start_window, end_window)
+            .await
+    }
 }

 #[cfg(test)]
 mod tests {
    use super::*;

+    fn test_config() -> CalDavAccountConfig {
+        CalDavAccountConfig {
+            account_id: "acct-1".to_string(),
+            caldav_url: "https://caldav.example.com/calendars/work/".to_string(),
+            username: "jmaes".to_string(),
+            auth_token: "app-token-secret".to_string(),
+        }
+    }
+
    #[test]
    fn build_report_query_format() {
        let query = CalDavClient::build_report_query("20240101T000000Z", "20240201T000000Z");
@@ -82,7 +193,7 @@ mod tests {

    #[test]
    fn parse_multistatus_response_extracts_events() {
-        let client = CalDavClient::new("acct-1");
+        let client = CalDavClient::new(test_config());
        let xml_response = r#"<?xml version="1.0" encoding="utf-8"?>
        <d:multistatus xmlns:d="DAV:" xmlns:c="urn:ietf:params:xml:ns:caldav">
            <d:response>
@@ -109,4 +220,11 @@ END:VCALENDAR</c:calendar-data>
        assert_eq!(events[0].summary, "Product Planning");
        assert_eq!(events[0].location, Some("Boardroom".to_string()));
    }
+
+    #[test]
+    fn format_query_timestamp_produces_ical_utc_form() {
+        let formatted =
+            CalDavClient::format_query_timestamp(1_704_067_200).expect("valid timestamp");
+        assert_eq!(formatted, "20240101T000000Z");
+    }
 }
@@ -1,7 +1,7 @@
 //! CardDAV (vCard RFC 6350) contact sync and XML query parser.

-use serde::{Deserialize, Serialize};
 use crate::parser::CalendarError;
+use serde::{Deserialize, Serialize};

 /// Contact entity representation synced over CardDAV.
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
@@ -34,7 +34,8 @@ impl CardDavClient {
        <d:getetag />
        <card:address-data />
    </d:prop>
-</card:addressbook-query>"#.to_string()
+</card:addressbook-query>"#
+            .to_string()
    }

    /// Parse raw vCard string into domain [`Contact`] entity.
@@ -66,7 +67,9 @@ impl CardDavClient {
        }

        if name.is_empty() && email.is_empty() {
-            return Err(CalendarError::ParseFailed("invalid or empty vCard data".to_string()));
+            return Err(CalendarError::ParseFailed(
+                "invalid or empty vCard data".to_string(),
+            ));
        }

        if name.is_empty() {
@@ -136,7 +139,9 @@ END:VCARD</card:address-data>
            </d:response>
        </d:multistatus>"#;

-        let contacts = client.parse_multistatus_response(xml).expect("parse multistatus");
+        let contacts = client
+            .parse_multistatus_response(xml)
+            .expect("parse multistatus");
        assert_eq!(contacts.len(), 1);
        assert_eq!(contacts[0].name, "Alice Dev");
    }
@@ -1,7 +1,9 @@
 //! iCalendar (RFC 5545), CalDAV (RFC 4791), and recurrence engine for Nuncio.

 #![forbid(unsafe_code)]
+#![cfg_attr(test, allow(clippy::unwrap_used, clippy::expect_used, clippy::panic))]

+pub mod backend;
 pub mod caldav;
 pub mod carddav;
 pub mod mock;
@@ -10,7 +12,8 @@ pub mod parser;
 pub mod rrule;
 pub mod scheduling;

-pub use caldav::CalDavClient;
+pub use backend::CalendarBackend;
+pub use caldav::{CalDavAccountConfig, CalDavClient};
 pub use carddav::{CardDavClient, Contact};
 pub use mock::MockCalendarBackend;
 pub use nlp::{NaturalLanguageScheduler, NlpError, ParsedSchedulingIntent};
@@ -1,8 +1,10 @@
 //! Deterministic mock calendar backend for offline testing and integration verification.

+use async_trait::async_trait;
 use nuncio_core::model::CalendarEvent;
 use std::sync::{Arc, Mutex};

+use crate::backend::CalendarBackend;
 use crate::parser::CalendarError;

 /// Thread-safe mock calendar backend for offline testing.
@@ -56,9 +58,14 @@ impl MockCalendarBackend {
        let matches = guard
            .iter()
            .filter(|e| {
+                // Interval-overlap (inclusive): an event is in the window if it
+                // starts before the window ends and ends after the window
+                // begins. Matches the CalendarBackend contract and the store's
+                // list_calendar_events query, so mock and persisted results
+                // agree for the same window.
                e.calendar_id == calendar_id
-                    && e.start_time >= start_window
-                    && e.end_time <= end_window
+                    && e.start_time <= end_window
+                    && e.end_time >= start_window
            })
            .cloned()
            .collect();
@@ -67,6 +74,18 @@ impl MockCalendarBackend {
    }
 }

+#[async_trait]
+impl CalendarBackend for MockCalendarBackend {
+    async fn fetch_events(
+        &self,
+        calendar_id: &str,
+        start_window: i64,
+        end_window: i64,
+    ) -> Result<Vec<CalendarEvent>, CalendarError> {
+        self.list_events(calendar_id, start_window, end_window)
+    }
+}
+
 #[cfg(test)]
 mod tests {
    use super::*;
@@ -100,6 +119,31 @@ mod tests {
            .is_err());
    }

+    /// Proves `MockCalendarBackend` is usable behind the `CalendarBackend` trait object, the
+    /// same way the daemon will inject either it or the real CalDAV client.
+    #[tokio::test]
+    async fn mock_calendar_backend_is_usable_as_a_trait_object() {
+        let mock = MockCalendarBackend::new();
+        mock.add_event(CalendarEvent {
+            id: "evt-trait-1".to_string(),
+            account_id: "acct-1".to_string(),
+            calendar_id: "cal-work".to_string(),
+            summary: "Trait Object Planning".to_string(),
+            start_time: 1700000000,
+            end_time: 1700003600,
+            rrule: None,
+            location: None,
+        });
+
+        let backend: Arc<dyn CalendarBackend> = Arc::new(mock);
+        let events = backend
+            .fetch_events("cal-work", 1699999000, 1700004000)
+            .await
+            .expect("fetch events succeeds");
+        assert_eq!(events.len(), 1);
+        assert_eq!(events[0].id, "evt-trait-1");
+    }
+
    #[tokio::test]
    async fn wiremock_caldav_report_simulation() {
        let mock_server = MockServer::start().await;
@@ -1,7 +1,10 @@
 //! iCalendar (RFC 5545) and VCard (RFC 6350) parser adapter wrapping `icalendar`.

+use chrono::{TimeZone, Utc};
+use chrono_tz::Tz;
 use icalendar::{Component, EventLike};
 use nuncio_core::model::CalendarEvent;
+use std::str::FromStr;
 use thiserror::Error;

 /// Errors returned by the iCalendar parsing engine.
@@ -10,6 +13,62 @@ pub enum CalendarError {
    /// Failed to parse RFC 5545 iCalendar payload.
    #[error("failed to parse iCalendar payload: {0}")]
    ParseFailed(String),
+
+    /// A `DTSTART`/`DTEND` carried a `TZID` parameter (RFC 5545 3.3.5 Form #3) that could not
+    /// be resolved to a single unambiguous UTC instant: either the TZID string is not a
+    /// recognized IANA zone name, or the local wall-clock value falls inside a DST transition
+    /// gap/overlap with no (or two) valid UTC equivalents. Returned instead of ever silently
+    /// substituting a zeroed or fixed-offset timestamp.
+    #[error("unresolvable TZID timezone reference: {0}")]
+    UnresolvableTimezone(String),
+
+    /// CalDAV network/transport-layer failure (connection, TLS, or an unexpected HTTP status)
+    /// distinct from a payload that connected fine but failed to parse.
+    #[error("CalDAV transport failure: {0}")]
+    TransportFailed(String),
+}
+
+/// Resolve an iCalendar `DATE`-or-`DATE-TIME` value to a UTC unix timestamp.
+///
+/// `date_only_time` supplies the wall-clock time assumed for a bare `DATE` value (no time
+/// component at all): start-of-day for `DTSTART`, end-of-day for `DTEND`, matching this
+/// parser's pre-existing whole-day-event convention.
+fn resolve_timestamp(
+    value: icalendar::DatePerhapsTime,
+    date_only_time: (u32, u32, u32),
+) -> Result<i64, CalendarError> {
+    match value {
+        icalendar::DatePerhapsTime::Date(date) => {
+            let (hour, min, sec) = date_only_time;
+            date.and_hms_opt(hour, min, sec)
+                .map(|naive| naive.and_utc().timestamp())
+                .ok_or_else(|| {
+                    CalendarError::ParseFailed(
+                        "invalid DATE value in iCalendar payload".to_string(),
+                    )
+                })
+        }
+        icalendar::DatePerhapsTime::DateTime(dt) => match dt {
+            icalendar::CalendarDateTime::Utc(dt) => Ok(dt.timestamp()),
+            // Floating times (RFC 5545 3.3.5 Form #1) carry no zone information at all -- there
+            // is no correct universal interpretation, only a documented convention. Treating
+            // the naive wall-clock value as if it were UTC is the pre-existing behavior here
+            // and is left unchanged: fixing it would require guessing a zone, which is exactly
+            // the kind of fabrication this parser must not do.
+            icalendar::CalendarDateTime::Floating(dt) => Ok(dt.and_utc().timestamp()),
+            icalendar::CalendarDateTime::WithTimezone { date_time, tzid } => {
+                let tz = Tz::from_str(&tzid)
+                    .map_err(|_| CalendarError::UnresolvableTimezone(tzid.clone()))?;
+                // `.single()` rejects ambiguous local times -- those that fall inside a DST
+                // "spring forward" gap (no valid instant) or "fall back" overlap (two valid
+                // instants) -- rather than guessing which offset the source server intended.
+                tz.from_local_datetime(&date_time)
+                    .single()
+                    .map(|resolved| resolved.with_timezone(&Utc).timestamp())
+                    .ok_or(CalendarError::UnresolvableTimezone(tzid))
+            }
+        },
+    }
 }

 /// iCalendar parser adapter converting raw `.ics` payloads into Nuncio [`CalendarEvent`] domain entities.
@@ -45,33 +104,15 @@ impl IcalParserAdapter {
                    .get("RRULE")
                    .map(|p| p.value().to_string());

-                let start_time = event
-                    .get_start()
-                    .map(|d| match d {
-                        icalendar::DatePerhapsTime::Date(date) => date
-                            .and_hms_opt(0, 0, 0)
-                            .map_or(0, |dt| dt.and_utc().timestamp()),
-                        icalendar::DatePerhapsTime::DateTime(dt) => match dt {
-                            icalendar::CalendarDateTime::Utc(dt) => dt.timestamp(),
-                            icalendar::CalendarDateTime::Floating(dt) => dt.and_utc().timestamp(),
-                            _ => 0,
-                        },
-                    })
-                    .unwrap_or(0);
+                let start_time = match event.get_start() {
+                    Some(value) => resolve_timestamp(value, (0, 0, 0))?,
+                    None => 0,
+                };

-                let end_time = event
-                    .get_end()
-                    .map(|d| match d {
-                        icalendar::DatePerhapsTime::Date(date) => date
-                            .and_hms_opt(23, 59, 59)
-                            .map_or(0, |dt| dt.and_utc().timestamp()),
-                        icalendar::DatePerhapsTime::DateTime(dt) => match dt {
-                            icalendar::CalendarDateTime::Utc(dt) => dt.timestamp(),
-                            icalendar::CalendarDateTime::Floating(dt) => dt.and_utc().timestamp(),
-                            _ => 0,
-                        },
-                    })
-                    .unwrap_or(start_time + 3600);
+                let end_time = match event.get_end() {
+                    Some(value) => resolve_timestamp(value, (23, 59, 59))?,
+                    None => start_time + 3600,
+                };

                return Ok(CalendarEvent {
                    id: id.to_string(),
@@ -142,4 +183,119 @@ mod tests {
            .to_string()
            .contains("exceeds maximum allowed limit of 25MB"));
    }
+
+    /// Regression for the TZID bug: `DTSTART;TZID=America/New_York:...` during Eastern
+    /// Daylight Time (UTC-4) must resolve to the correct UTC instant, not fall through the old
+    /// catch-all that zeroed the timestamp.
+    #[test]
+    fn parse_tzid_dtstart_during_edt_resolves_correct_utc_epoch() {
+        let ics = "BEGIN:VCALENDAR\r\n\
+                   VERSION:2.0\r\n\
+                   BEGIN:VEVENT\r\n\
+                   SUMMARY:Standup EDT\r\n\
+                   DTSTART;TZID=America/New_York:20240715T090000\r\n\
+                   DTEND;TZID=America/New_York:20240715T100000\r\n\
+                   END:VEVENT\r\n\
+                   END:VCALENDAR";
+
+        let event = IcalParserAdapter::parse_ical("evt-tz-edt", "acct-1", "cal-1", ics)
+            .expect("parse succeeds");
+
+        assert_ne!(
+            event.start_time, 0,
+            "TZID timestamp must never be silently zeroed"
+        );
+        // 2024-07-15 09:00 America/New_York is EDT (UTC-4) -> 2024-07-15T13:00:00Z.
+        assert_eq!(event.start_time, 1_721_048_400);
+        // 2024-07-15 10:00 America/New_York (EDT) -> 2024-07-15T14:00:00Z.
+        assert_eq!(event.end_time, 1_721_052_000);
+    }
+
+    /// Same wall-clock hour as the EDT fixture above but on the winter side of the DST
+    /// boundary: America/New_York is EST (UTC-5) there, so the resolved UTC instant must
+    /// differ by an hour from the summer fixture -- proving the fix performs a genuine
+    /// chrono_tz calendar-aware lookup rather than assuming a fixed UTC offset.
+    #[test]
+    fn parse_tzid_dtstart_during_est_resolves_correct_utc_epoch_across_dst_boundary() {
+        let ics = "BEGIN:VCALENDAR\r\n\
+                   VERSION:2.0\r\n\
+                   BEGIN:VEVENT\r\n\
+                   SUMMARY:Standup EST\r\n\
+                   DTSTART;TZID=America/New_York:20240115T090000\r\n\
+                   DTEND;TZID=America/New_York:20240115T100000\r\n\
+                   END:VEVENT\r\n\
+                   END:VCALENDAR";
+
+        let event = IcalParserAdapter::parse_ical("evt-tz-est", "acct-1", "cal-1", ics)
+            .expect("parse succeeds");
+
+        assert_ne!(
+            event.start_time, 0,
+            "TZID timestamp must never be silently zeroed"
+        );
+        // 2024-01-15 09:00 America/New_York is EST (UTC-5) -> 2024-01-15T14:00:00Z.
+        assert_eq!(event.start_time, 1_705_327_200);
+        // 2024-01-15 10:00 America/New_York (EST) -> 2024-01-15T15:00:00Z.
+        assert_eq!(event.end_time, 1_705_330_800);
+    }
+
+    /// Plain `Z`-suffixed UTC datetimes must keep working exactly as before the TZID fix.
+    #[test]
+    fn parse_plain_utc_z_dtstart_has_no_regression() {
+        let ics = "BEGIN:VCALENDAR\r\n\
+                   VERSION:2.0\r\n\
+                   BEGIN:VEVENT\r\n\
+                   SUMMARY:UTC Event\r\n\
+                   DTSTART:20240301T120000Z\r\n\
+                   DTEND:20240301T130000Z\r\n\
+                   END:VEVENT\r\n\
+                   END:VCALENDAR";
+
+        let event = IcalParserAdapter::parse_ical("evt-utc", "acct-1", "cal-1", ics)
+            .expect("parse succeeds");
+
+        assert_eq!(event.start_time, 1_709_294_400);
+        assert_eq!(event.end_time, 1_709_298_000);
+    }
+
+    /// An unresolvable TZID (not a real IANA zone) must surface as a genuine error, never a
+    /// fabricated zero timestamp.
+    #[test]
+    fn parse_unknown_tzid_returns_error_not_a_fabricated_zero() {
+        let ics = "BEGIN:VCALENDAR\r\n\
+                   VERSION:2.0\r\n\
+                   BEGIN:VEVENT\r\n\
+                   SUMMARY:Bogus TZID Event\r\n\
+                   DTSTART;TZID=Not/A_Real_Zone:20240115T090000\r\n\
+                   END:VEVENT\r\n\
+                   END:VCALENDAR";
+
+        let err = IcalParserAdapter::parse_ical("evt-bad-tz", "acct-1", "cal-1", ics)
+            .expect_err("unresolvable TZID must be a real error, not a zeroed timestamp");
+        assert!(
+            matches!(err, CalendarError::UnresolvableTimezone(ref tz) if tz == "Not/A_Real_Zone")
+        );
+    }
+
+    /// A local time inside a DST "spring forward" gap has no valid instant, so
+    /// `from_local_datetime(..).single()` yields `None`. That must surface as an
+    /// error rather than a silently substituted timestamp. In America/New_York,
+    /// 2024-03-10 02:30 never occurs (clocks jump 02:00 -> 03:00).
+    #[test]
+    fn parse_tzid_in_dst_gap_returns_error_not_a_fabricated_timestamp() {
+        let ics = "BEGIN:VCALENDAR\r\n\
+                   VERSION:2.0\r\n\
+                   BEGIN:VEVENT\r\n\
+                   SUMMARY:Nonexistent Local Time\r\n\
+                   DTSTART;TZID=America/New_York:20240310T023000\r\n\
+                   END:VEVENT\r\n\
+                   END:VCALENDAR";
+
+        let err = IcalParserAdapter::parse_ical("evt-gap", "acct-1", "cal-1", ics).expect_err(
+            "a nonexistent DST-gap local time must be an error, not a fabricated instant",
+        );
+        assert!(
+            matches!(err, CalendarError::UnresolvableTimezone(ref tz) if tz == "America/New_York")
+        );
+    }
 }
@@ -67,17 +67,30 @@ mod tests {

    #[test]
    fn generate_1on1_link_format() {
-        let link = SchedulingLinkGenerator::generate_1on1_link("james.maes@kof22.com", 30, "Architecture Review");
+        let link = SchedulingLinkGenerator::generate_1on1_link(
+            "james.maes@kof22.com",
+            30,
+            "Architecture Review",
+        );
        assert_eq!(link.host_email, "james.maes@kof22.com");
        assert_eq!(link.duration_mins, 30);
-        assert_eq!(link.booking_url, "https://nuncio.mx/meet/james.maes@kof22.com/architecture-review?dur=30");
+        assert_eq!(
+            link.booking_url,
+            "https://nuncio.mx/meet/james.maes@kof22.com/architecture-review?dur=30"
+        );
    }

    #[test]
    fn parse_duration_minutes_variations() {
        assert_eq!(SchedulingLinkGenerator::parse_duration_minutes("30m"), 30);
        assert_eq!(SchedulingLinkGenerator::parse_duration_minutes("1h"), 60);
-        assert_eq!(SchedulingLinkGenerator::parse_duration_minutes("45 mins"), 45);
-        assert_eq!(SchedulingLinkGenerator::parse_duration_minutes("2 hours"), 120);
+        assert_eq!(
+            SchedulingLinkGenerator::parse_duration_minutes("45 mins"),
+            45
+        );
+        assert_eq!(
+            SchedulingLinkGenerator::parse_duration_minutes("2 hours"),
+            120
+        );
    }
 }
@@ -0,0 +1,119 @@
+//! WireMock integration test suite for the real CalDAV `REPORT` transport.
+
+#![allow(clippy::unwrap_used, clippy::expect_used, clippy::panic)]
+
+use nuncio_cal::{CalDavAccountConfig, CalDavClient, CalendarBackend, CalendarError};
+use wiremock::matchers::{method, path};
+use wiremock::{Mock, MockServer, ResponseTemplate};
+
+/// A canned CalDAV `multistatus` response containing one TZID-qualified VEVENT and one plain
+/// UTC VEVENT, exercising both the real HTTP transport and the TZID resolution fix together.
+fn multistatus_body() -> String {
+    r#"<?xml version="1.0" encoding="utf-8"?>
+<d:multistatus xmlns:d="DAV:" xmlns:c="urn:ietf:params:xml:ns:caldav">
+    <d:response>
+        <d:href>/calendars/work/standup.ics</d:href>
+        <d:propstat>
+            <d:prop>
+                <c:calendar-data>BEGIN:VCALENDAR
+VERSION:2.0
+BEGIN:VEVENT
+SUMMARY:Wiremock CalDAV Standup
+LOCATION:Conference Room B
+DTSTART;TZID=America/New_York:20240715T090000
+DTEND;TZID=America/New_York:20240715T100000
+END:VEVENT
+END:VCALENDAR</c:calendar-data>
+            </d:prop>
+        </d:propstat>
+    </d:response>
+    <d:response>
+        <d:href>/calendars/work/utc-review.ics</d:href>
+        <d:propstat>
+            <d:prop>
+                <c:calendar-data>BEGIN:VCALENDAR
+VERSION:2.0
+BEGIN:VEVENT
+SUMMARY:Wiremock UTC Review
+DTSTART:20240301T120000Z
+DTEND:20240301T130000Z
+END:VEVENT
+END:VCALENDAR</c:calendar-data>
+            </d:prop>
+        </d:propstat>
+    </d:response>
+</d:multistatus>"#
+        .to_string()
+}
+
+#[tokio::test]
+async fn wiremock_caldav_report_fetches_and_resolves_tzid_events() {
+    let mock_server = MockServer::start().await;
+
+    Mock::given(method("REPORT"))
+        .and(path("/calendars/work/"))
+        .respond_with(ResponseTemplate::new(207).set_body_string(multistatus_body()))
+        .mount(&mock_server)
+        .await;
+
+    let config = CalDavAccountConfig {
+        account_id: "acct-wm-1".to_string(),
+        caldav_url: format!("{}/calendars/work/", mock_server.uri()),
+        username: "james.maes".to_string(),
+        auth_token: "wiremock-app-token".to_string(),
+    };
+    let client = CalDavClient::new(config);
+
+    // Drive the real client through the `CalendarBackend` trait, exactly how the daemon will
+    // invoke either this real client or `MockCalendarBackend` behind the same seam.
+    let events: Vec<_> =
+        CalendarBackend::fetch_events(&client, "cal-work", 1_700_000_000, 1_800_000_000)
+            .await
+            .expect("fetch_events succeeds against the wiremock server");
+
+    assert_eq!(events.len(), 2);
+
+    let tzid_event = events
+        .iter()
+        .find(|e| e.summary == "Wiremock CalDAV Standup")
+        .expect("TZID event present");
+    assert_eq!(tzid_event.account_id, "acct-wm-1");
+    assert_eq!(tzid_event.calendar_id, "cal-work");
+    assert_eq!(tzid_event.location, Some("Conference Room B".to_string()));
+    // 2024-07-15 09:00 America/New_York is EDT (UTC-4) -> 2024-07-15T13:00:00Z.
+    assert_eq!(tzid_event.start_time, 1_721_048_400);
+    assert_eq!(tzid_event.end_time, 1_721_052_000);
+
+    let utc_event = events
+        .iter()
+        .find(|e| e.summary == "Wiremock UTC Review")
+        .expect("UTC event present");
+    assert_eq!(utc_event.start_time, 1_709_294_400);
+    assert_eq!(utc_event.end_time, 1_709_298_000);
+}
+
+#[tokio::test]
+async fn wiremock_caldav_report_server_error_surfaces_as_transport_failure() {
+    let mock_server = MockServer::start().await;
+
+    Mock::given(method("REPORT"))
+        .and(path("/calendars/broken/"))
+        .respond_with(ResponseTemplate::new(500))
+        .mount(&mock_server)
+        .await;
+
+    let config = CalDavAccountConfig {
+        account_id: "acct-wm-2".to_string(),
+        caldav_url: format!("{}/calendars/broken/", mock_server.uri()),
+        username: "james.maes".to_string(),
+        auth_token: "wiremock-app-token".to_string(),
+    };
+    let client = CalDavClient::new(config);
+
+    let err = client
+        .fetch_remote_events("cal-broken", 1_700_000_000, 1_800_000_000)
+        .await
+        .expect_err("a 500 response must be a real error, not fabricated empty success");
+
+    assert!(matches!(err, CalendarError::TransportFailed(_)));
+}
@@ -16,9 +16,11 @@ nuncio-cal = { path = "../nuncio-cal" }
 nuncio-store = { path = "../nuncio-store" }
 nuncio-filter = { path = "../nuncio-filter" }
 nuncio-contacts = { path = "../nuncio-contacts" }
+nuncio-proto = { path = "../nuncio-proto" }

 tokio.workspace = true
 sqlx.workspace = true
+tonic.workspace = true
 clap.workspace = true
 serde.workspace = true
 serde_json.workspace = true
@@ -26,5 +28,9 @@ thiserror.workspace = true
 tracing.workspace = true
 rpassword.workspace = true
 chrono.workspace = true
+hex.workspace = true
+
+[dev-dependencies]
+tokio-stream = { workspace = true, features = ["net"] }


@@ -1,7 +1,52 @@
 //! Command-line argument hierarchy and Clap subcommand parsing.

 use clap::{Parser, Subcommand};
-use serde::{Deserialize, Serialize};
+use serde::{Deserialize, Deserializer, Serialize, Serializer};
+
+/// Carries an account password credential from an interactive `rpassword`
+/// prompt (see `nuncio-cli`'s `main`) through to `Accounts/AddAccount`
+/// without ever being reachable as a Clap CLI flag, printed by `Debug`, or
+/// carried by value through `Serialize`/`Deserialize`.
+///
+/// `AccountSubcommand::Add`'s `password` field is `#[arg(skip)]`, so Clap
+/// never parses it from argv; `main` populates it exactly once, right after
+/// `Cli::parse()`, by prompting without echo. `Debug`, `Serialize` are
+/// hand-implemented below to redact the value on principle -- defense in
+/// depth in case a future caller logs or serializes a `Commands` value --
+/// and `Deserialize` always yields an empty password, since a password
+/// must never round-trip through a serialized command payload.
+#[derive(Clone, Default)]
+pub struct PasswordArg(pub String);
+
+impl std::fmt::Debug for PasswordArg {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.write_str("PasswordArg(\"[REDACTED]\")")
+    }
+}
+
+impl PartialEq for PasswordArg {
+    fn eq(&self, other: &Self) -> bool {
+        self.0 == other.0
+    }
+}
+
+impl Eq for PasswordArg {}
+
+impl Serialize for PasswordArg {
+    fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
+        serializer.serialize_str("[REDACTED]")
+    }
+}
+
+impl<'de> Deserialize<'de> for PasswordArg {
+    fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
+        // Discard whatever was serialized (see the redacting `Serialize`
+        // impl above) and always yield an empty password rather than ever
+        // reconstructing a real credential from a deserialized payload.
+        let _ = String::deserialize(deserializer);
+        Ok(PasswordArg(String::new()))
+    }
+}

 /// Nuncio CLI — Pure Noun + Verb Developer-First Mail & Calendar Automation.
 #[derive(Parser, Debug, Clone, PartialEq, Eq)]
@@ -87,12 +132,6 @@ pub enum Commands {
        #[command(subcommand)]
        action: ContactSubcommand,
    },
-    /// Launch centralized local background server daemon (`nuncio daemon`).
-    Daemon {
-        /// TCP port to bind IPC daemon server to (default: 9422).
-        #[arg(long, default_value = "9422")]
-        port: u16,
-    },
 }

 /// Contact subcommands (`nuncio contact <verb>`).
@@ -131,7 +170,6 @@ pub enum UpdateSubcommand {
    Apply,
 }

-
 /// Account subcommands (`nuncio account <verb>`).
 #[derive(Subcommand, Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 #[serde(rename_all = "kebab-case")]
@@ -161,6 +199,12 @@ pub enum AccountSubcommand {
        /// SMTP connection transport mode (implicit_tls, start_tls, plain).
        #[arg(long, default_value = "implicit_tls", help = "SMTP transport mode")]
        smtp_mode: String,
+        /// Account password credential. Never a CLI flag -- always read
+        /// interactively without echo (via `rpassword`) in `main` and
+        /// injected here immediately before dispatch to the daemon's
+        /// `Accounts/AddAccount` RPC. See [`PasswordArg`].
+        #[arg(skip)]
+        password: PasswordArg,
    },
    /// Display details for a specific configured account.
    Show {
@@ -239,6 +283,47 @@ pub enum MailSubcommand {
        #[arg(short, long, help = "Search query string")]
        query: String,
    },
+    /// Mark a message read or unread.
+    Mark {
+        /// Unique message identifier.
+        #[arg(short, long, help = "Unique message identifier")]
+        id: String,
+        /// Mark the message as read.
+        #[arg(long, help = "Mark the message as read", conflicts_with = "unread")]
+        read: bool,
+        /// Mark the message as unread.
+        #[arg(long, help = "Mark the message as unread", conflicts_with = "read")]
+        unread: bool,
+    },
+    /// Export mailbox messages to a portable file format: MBOX, an EML
+    /// zip archive, JSON, or JSON Lines.
+    Export {
+        /// Export format (mbox, eml, json, or jsonl).
+        #[arg(
+            short = 'f',
+            long,
+            default_value = "mbox",
+            help = "Export format (mbox, eml, json, jsonl)"
+        )]
+        format: String,
+        /// Destination output file path, on the daemon's host filesystem.
+        #[arg(short = 'o', long, help = "Destination output file path")]
+        out: String,
+        /// Restrict the export to a single account's messages.
+        #[arg(
+            long,
+            help = "Restrict export to a single account ID",
+            conflicts_with = "folder"
+        )]
+        account: Option<String>,
+        /// Restrict the export to a single folder's messages.
+        #[arg(
+            long,
+            help = "Restrict export to a single folder ID",
+            conflicts_with = "account"
+        )]
+        folder: Option<String>,
+    },
 }

 /// Folder subcommands (`nuncio folder <verb>`).
@@ -265,6 +350,30 @@ pub enum CalSubcommand {
 pub enum SystemSubcommand {
    /// Display system, daemon, and event bus status.
    Status,
+    /// WORM (Write Once, Read Many) tamper-evident audit ledger operations
+    /// (`nuncio system audit <verb>`).
+    Audit {
+        #[command(subcommand)]
+        action: AuditSubcommand,
+    },
+}
+
+/// Audit subcommands (`nuncio system audit <verb>`).
+#[derive(Subcommand, Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "kebab-case")]
+pub enum AuditSubcommand {
+    /// List persisted WORM audit ledger records, sequence ascending.
+    List {
+        /// Max records to fetch (0 = server default).
+        #[arg(short, long, default_value_t = 50, help = "Max records to fetch")]
+        limit: u32,
+        /// Pagination offset.
+        #[arg(short, long, default_value_t = 0, help = "Pagination offset")]
+        offset: u32,
+    },
+    /// Verify the WORM audit ledger's cryptographic HMAC hash-chain
+    /// integrity.
+    Verify,
 }

 /// Filter subcommands (`nuncio filter <verb>`).
@@ -306,6 +415,12 @@ pub enum FilterSubcommand {
        #[arg(short, long, help = "Rule identifier")]
        id: String,
    },
+    /// Validate an NSQL query's syntax and semantics without persisting it.
+    Validate {
+        /// NSQL query string to validate.
+        #[arg(short, long, help = "NSQL query string")]
+        sql: String,
+    },
    /// Test / dry-run NSQL query against an email.
    Test {
        /// NSQL query string to test.
@@ -369,6 +484,7 @@ mod tests {
                    smtp_port: 465,
                    imap_mode: "implicit_tls".to_string(),
                    smtp_mode: "implicit_tls".to_string(),
+                    password: PasswordArg::default(),
                }
            }
        );
@@ -395,6 +511,142 @@ mod tests {
                }
            }
        );
+
+        let cli_mark_read =
+            Cli::parse_from(["nuncio", "mail", "mark", "--id", "msg-123", "--read"]);
+        assert_eq!(
+            cli_mark_read.command,
+            Commands::Mail {
+                action: MailSubcommand::Mark {
+                    id: "msg-123".to_string(),
+                    read: true,
+                    unread: false,
+                }
+            }
+        );
+
+        let cli_mark_unread =
+            Cli::parse_from(["nuncio", "mail", "mark", "--id", "msg-123", "--unread"]);
+        assert_eq!(
+            cli_mark_unread.command,
+            Commands::Mail {
+                action: MailSubcommand::Mark {
+                    id: "msg-123".to_string(),
+                    read: false,
+                    unread: true,
+                }
+            }
+        );
+
+        // `--read` and `--unread` are mutually exclusive at the Clap level.
+        let conflict = Cli::try_parse_from([
+            "nuncio", "mail", "mark", "--id", "msg-123", "--read", "--unread",
+        ]);
+        assert!(conflict.is_err());
+    }
+
+    #[test]
+    fn parse_pure_noun_verb_mail_export_command() {
+        let cli_export = Cli::parse_from([
+            "nuncio",
+            "mail",
+            "export",
+            "--format",
+            "json",
+            "--out",
+            "/tmp/out.json",
+        ]);
+        assert_eq!(
+            cli_export.command,
+            Commands::Mail {
+                action: MailSubcommand::Export {
+                    format: "json".to_string(),
+                    out: "/tmp/out.json".to_string(),
+                    account: None,
+                    folder: None,
+                }
+            }
+        );
+
+        let cli_export_scoped = Cli::parse_from([
+            "nuncio",
+            "mail",
+            "export",
+            "--format",
+            "jsonl",
+            "--out",
+            "/tmp/scoped.jsonl",
+            "--account",
+            "acct-1",
+        ]);
+        assert_eq!(
+            cli_export_scoped.command,
+            Commands::Mail {
+                action: MailSubcommand::Export {
+                    format: "jsonl".to_string(),
+                    out: "/tmp/scoped.jsonl".to_string(),
+                    account: Some("acct-1".to_string()),
+                    folder: None,
+                }
+            }
+        );
+
+        // `--account` and `--folder` are mutually exclusive at the Clap
+        // level -- an export scope is either "one account", "one folder",
+        // or (neither flag) "everything".
+        let conflict = Cli::try_parse_from([
+            "nuncio",
+            "mail",
+            "export",
+            "--out",
+            "/tmp/out.json",
+            "--account",
+            "acct-1",
+            "--folder",
+            "inbox",
+        ]);
+        assert!(conflict.is_err());
+    }
+
+    #[test]
+    fn parse_pure_noun_verb_system_audit_commands() {
+        let cli_list = Cli::parse_from(["nuncio", "system", "audit", "list"]);
+        assert_eq!(
+            cli_list.command,
+            Commands::System {
+                action: SystemSubcommand::Audit {
+                    action: AuditSubcommand::List {
+                        limit: 50,
+                        offset: 0,
+                    }
+                }
+            }
+        );
+
+        let cli_list_paged = Cli::parse_from([
+            "nuncio", "system", "audit", "list", "--limit", "10", "--offset", "5",
+        ]);
+        assert_eq!(
+            cli_list_paged.command,
+            Commands::System {
+                action: SystemSubcommand::Audit {
+                    action: AuditSubcommand::List {
+                        limit: 10,
+                        offset: 5,
+                    }
+                }
+            }
+        );
+
+        let cli_verify = Cli::parse_from(["nuncio", "system", "audit", "verify"]);
+        assert_eq!(
+            cli_verify.command,
+            Commands::System {
+                action: SystemSubcommand::Audit {
+                    action: AuditSubcommand::Verify
+                }
+            }
+        );
    }

    #[test]
@@ -415,5 +667,53 @@ mod tests {
            }
        );
    }
-}

+    #[test]
+    fn account_add_password_is_never_parsed_from_argv() {
+        // `--password` is deliberately not a recognized flag: the password
+        // MUST always come from an interactive, non-echoing prompt in
+        // `main`, never from argv (which would land it in shell history and
+        // process listings).
+        let cli_add = Cli::parse_from([
+            "nuncio",
+            "account",
+            "add",
+            "--email",
+            "a@b.com",
+            "--imap-host",
+            "imap.b.com",
+        ]);
+        match cli_add.command {
+            Commands::Account {
+                action: AccountSubcommand::Add { password, .. },
+            } => assert_eq!(password, PasswordArg::default()),
+            other => panic!("expected Account::Add, got {other:?}"),
+        }
+    }
+
+    #[test]
+    fn password_arg_debug_and_serialize_always_redact_the_value() {
+        let secret = PasswordArg("super-secret-value".to_string());
+        assert_eq!(format!("{secret:?}"), "PasswordArg(\"[REDACTED]\")");
+
+        let json = serde_json::to_string(&secret).expect("serializes");
+        assert_eq!(json, "\"[REDACTED]\"");
+        assert!(!json.contains("super-secret-value"));
+    }
+
+    #[test]
+    fn password_arg_deserialize_never_reconstructs_a_real_credential() {
+        let deserialized: PasswordArg =
+            serde_json::from_str("\"super-secret-value\"").expect("deserializes");
+        assert_eq!(deserialized, PasswordArg::default());
+        assert_eq!(deserialized.0, "");
+    }
+
+    #[test]
+    fn password_arg_equality_and_default() {
+        assert_eq!(PasswordArg::default(), PasswordArg(String::new()));
+        assert_ne!(PasswordArg("a".to_string()), PasswordArg("b".to_string()));
+        let cloned = PasswordArg("clone-me".to_string()).clone();
+        assert_eq!(cloned.0, "clone-me");
+    }
+}
@@ -1,11 +1,14 @@
 //! Nuncio CLI library.

+#![cfg_attr(test, allow(clippy::unwrap_used, clippy::expect_used, clippy::panic))]
+
 pub mod args;
 pub mod output;
 pub mod runner;

 pub use args::{
-    AccountSubcommand, CalSubcommand, Commands, FolderSubcommand, MailSubcommand, SystemSubcommand,
+    AccountSubcommand, CalSubcommand, Commands, FolderSubcommand, MailSubcommand, PasswordArg,
+    SystemSubcommand,
 };
 pub use output::JsonResponse;
 pub use runner::HeadlessRunner;
@@ -1,9 +1,25 @@
 use clap::Parser;
-use nuncio_cli::{args::Cli, HeadlessRunner};
+use nuncio_cli::{args::Cli, AccountSubcommand, Commands, HeadlessRunner, PasswordArg};

 #[tokio::main]
 async fn main() -> Result<(), Box<dyn std::error::Error>> {
-    let cli = Cli::parse();
+    let mut cli = Cli::parse();
+
+    // `account add`'s password is deliberately never a Clap-parsed CLI
+    // flag (see `PasswordArg`'s doc comment): read it here, interactively
+    // and without echo, immediately after parsing argv and before any
+    // other work, then inject it into the already-parsed command. This is
+    // the ONLY place in the whole `nuncio-cli` binary that ever reads a raw
+    // password from the terminal.
+    if let Commands::Account {
+        action: AccountSubcommand::Add { password, .. },
+    } = &mut cli.command
+    {
+        let entered = rpassword::prompt_password("Account password: ")
+            .map_err(|e| format!("failed to read password: {e}"))?;
+        *password = PasswordArg(entered);
+    }
+
    let runner = HeadlessRunner::ephemeral().await?;

    let output_str = runner.execute_command(&cli.command, cli.json).await;
@@ -1,26 +1,24 @@
 //! E2E System Test Suite for nuncio-cli.

+#![allow(clippy::unwrap_used, clippy::expect_used, clippy::panic)]
+
 use nuncio_cli::{
    AccountSubcommand, CalSubcommand, Commands, FolderSubcommand, HeadlessRunner, MailSubcommand,
-    SystemSubcommand,
+    PasswordArg, SystemSubcommand,
 };
+use nuncio_store::vault::SecretManager;
 use serde_json::Value;
+use std::sync::Arc;

 #[tokio::test]
 async fn system_test_cli_noun_verb_execution_matrix() {
    let runner = HeadlessRunner::ephemeral().await.expect("runner init");

-    // 1. System status
-    let out: String = runner
-        .execute_command(
-            &Commands::System {
-                action: SystemSubcommand::Status,
-            },
-            true,
-        )
-        .await;
-    let json: Value = serde_json::from_str(&out).expect("valid json");
-    assert_eq!(json["status"], "ok");
+    // 1. System status is a real gRPC client of the `nunciod` daemon, so it
+    // is exercised separately below via `ephemeral_with` + `SecretManager::mock()`
+    // rather than through this `ephemeral()`-constructed runner (which holds
+    // the production `SecretManager` and must never touch the real OS
+    // keyring in a test).

    // 1b. Banner output
    let out: String = runner.execute_command(&Commands::Banner, true).await;
@@ -33,75 +31,16 @@ async fn system_test_cli_noun_verb_execution_matrix() {
    let json: Value = serde_json::from_str(&out).expect("valid json");
    assert_eq!(json["status"], "ok");

-    // 2. Account list & add
-    let out: String = runner
-        .execute_command(
-            &Commands::Account {
-                action: AccountSubcommand::List,
-            },
-            true,
-        )
-        .await;
-    let json: Value = serde_json::from_str(&out).expect("valid json");
-    assert_eq!(json["status"], "ok");
+    // 2. Account list & add are real gRPC clients of the `nunciod` daemon's
+    // `Accounts` API, so -- exactly like `system status` above -- they are
+    // exercised separately below via `ephemeral_with` + `SecretManager::mock()`
+    // rather than through this `ephemeral()`-constructed runner.

-    let out: String = runner
-        .execute_command(
-            &Commands::Account {
-                action: AccountSubcommand::Add {
-                    email: "test@nuncio.mx".to_string(),
-                    imap_host: "mail.nuncio.mx".to_string(),
-                    imap_port: 993,
-                    smtp_host: "mail.nuncio.mx".to_string(),
-                    smtp_port: 465,
-                    imap_mode: "implicit_tls".to_string(),
-                    smtp_mode: "implicit_tls".to_string(),
-                },
-            },
-            true,
-        )
-        .await;
-    let json: Value = serde_json::from_str(&out).expect("valid json");
-    assert_eq!(json["status"], "ok");
-
-    // 3. Folder list
-    let out: String = runner
-        .execute_command(
-            &Commands::Folder {
-                action: FolderSubcommand::List,
-            },
-            true,
-        )
-        .await;
-    let json: Value = serde_json::from_str(&out).expect("valid json");
-    assert_eq!(json["status"], "ok");
-
-    // 4. Mail list & search & read
-    let out: String = runner
-        .execute_command(
-            &Commands::Mail {
-                action: MailSubcommand::List {
-                    folder: "INBOX".to_string(),
-                },
-            },
-            true,
-        )
-        .await;
-    let json: Value = serde_json::from_str(&out).expect("valid json");
-    assert_eq!(json["status"], "ok");
-
-    let out: String = runner
-        .execute_command(
-            &Commands::Mail {
-                action: MailSubcommand::Search {
-                    query: "Architecture".to_string(),
-                },
-            },
-            true,
-        )
-        .await;
-    let json: Value = serde_json::from_str(&out).expect("valid json");
-    assert_eq!(json["status"], "ok");
+    // 3. Folder list & 4. Mail list/search/read/mark are real gRPC clients
+    // of the `nunciod` daemon's `Mail` API, so -- exactly like `system
+    // status` and `account add`/`list` above -- they are exercised
+    // separately below via `ephemeral_with` + `SecretManager::mock()`
+    // rather than through this `ephemeral()`-constructed runner.

    // 5. Calendar list & sync
    let out: String = runner
@@ -115,3 +54,183 @@ async fn system_test_cli_noun_verb_execution_matrix() {
    let json: Value = serde_json::from_str(&out).expect("valid json");
    assert_eq!(json["status"], "ok");
 }
+
+/// `system status` is a real gRPC client of the `nunciod` daemon. With no
+/// daemon reachable at an address nothing is listening on, it must report
+/// a clear, honest error rather than fabricating a status.
+#[tokio::test]
+async fn system_status_reports_honest_error_when_daemon_unreachable() {
+    let listener = tokio::net::TcpListener::bind("127.0.0.1:0")
+        .await
+        .expect("bind ephemeral loopback port");
+    let addr = listener.local_addr().expect("listener has local addr");
+    drop(listener); // free the port; nothing is listening on it now
+
+    let runner = HeadlessRunner::ephemeral_with(Arc::new(SecretManager::mock()), addr.to_string())
+        .await
+        .expect("runner init");
+
+    let out: String = runner
+        .execute_command(
+            &Commands::System {
+                action: SystemSubcommand::Status,
+            },
+            true,
+        )
+        .await;
+    let json: Value = serde_json::from_str(&out).expect("valid json");
+    assert_eq!(json["status"], "error");
+    assert!(json["error"]
+        .as_str()
+        .expect("error message present")
+        .contains("unreachable"));
+}
+
+/// `account add` / `account list` are real gRPC clients of the `nunciod`
+/// daemon's `Accounts` API. With no daemon reachable, both must report a
+/// clear, honest error rather than fabricating success or silently
+/// falling back to any local state.
+#[tokio::test]
+async fn account_add_and_list_report_honest_errors_when_daemon_unreachable() {
+    let listener = tokio::net::TcpListener::bind("127.0.0.1:0")
+        .await
+        .expect("bind ephemeral loopback port");
+    let addr = listener.local_addr().expect("listener has local addr");
+    drop(listener); // free the port; nothing is listening on it now
+
+    let runner = HeadlessRunner::ephemeral_with(Arc::new(SecretManager::mock()), addr.to_string())
+        .await
+        .expect("runner init");
+
+    let list_out: String = runner
+        .execute_command(
+            &Commands::Account {
+                action: AccountSubcommand::List,
+            },
+            true,
+        )
+        .await;
+    let list_json: Value = serde_json::from_str(&list_out).expect("valid json");
+    assert_eq!(list_json["status"], "error");
+    assert!(list_json["error"]
+        .as_str()
+        .expect("error message present")
+        .contains("unreachable"));
+
+    let add_out: String = runner
+        .execute_command(
+            &Commands::Account {
+                action: AccountSubcommand::Add {
+                    email: "test@nuncio.mx".to_string(),
+                    imap_host: "mail.nuncio.mx".to_string(),
+                    imap_port: 993,
+                    smtp_host: "mail.nuncio.mx".to_string(),
+                    smtp_port: 465,
+                    imap_mode: "implicit_tls".to_string(),
+                    smtp_mode: "implicit_tls".to_string(),
+                    password: PasswordArg("irrelevant-unreachable-daemon".to_string()),
+                },
+            },
+            true,
+        )
+        .await;
+    let add_json: Value = serde_json::from_str(&add_out).expect("valid json");
+    assert_eq!(add_json["status"], "error");
+    assert!(add_json["error"]
+        .as_str()
+        .expect("error message present")
+        .contains("unreachable"));
+    // The password must never leak into an error message either.
+    assert!(!add_out.contains("irrelevant-unreachable-daemon"));
+}
+
+/// `folder list`, `mail list`, `mail read`, `mail search`, and `mail mark`
+/// are real gRPC clients of the `nunciod` daemon's `Mail` API. With no
+/// daemon reachable, all of them must report a clear, honest error rather
+/// than fabricating an empty result.
+#[tokio::test]
+async fn mail_and_folder_report_honest_errors_when_daemon_unreachable() {
+    let listener = tokio::net::TcpListener::bind("127.0.0.1:0")
+        .await
+        .expect("bind ephemeral loopback port");
+    let addr = listener.local_addr().expect("listener has local addr");
+    drop(listener); // free the port; nothing is listening on it now
+
+    let runner = HeadlessRunner::ephemeral_with(Arc::new(SecretManager::mock()), addr.to_string())
+        .await
+        .expect("runner init");
+
+    let assert_honest_error = |out: String| {
+        let json: Value = serde_json::from_str(&out).expect("valid json");
+        assert_eq!(json["status"], "error");
+        assert!(json["error"]
+            .as_str()
+            .expect("error message present")
+            .contains("unreachable"));
+    };
+
+    assert_honest_error(
+        runner
+            .execute_command(
+                &Commands::Folder {
+                    action: FolderSubcommand::List,
+                },
+                true,
+            )
+            .await,
+    );
+
+    assert_honest_error(
+        runner
+            .execute_command(
+                &Commands::Mail {
+                    action: MailSubcommand::List {
+                        folder: "INBOX".to_string(),
+                    },
+                },
+                true,
+            )
+            .await,
+    );
+
+    assert_honest_error(
+        runner
+            .execute_command(
+                &Commands::Mail {
+                    action: MailSubcommand::Read {
+                        id: "msg-1".to_string(),
+                    },
+                },
+                true,
+            )
+            .await,
+    );
+
+    assert_honest_error(
+        runner
+            .execute_command(
+                &Commands::Mail {
+                    action: MailSubcommand::Search {
+                        query: "Architecture".to_string(),
+                    },
+                },
+                true,
+            )
+            .await,
+    );
+
+    assert_honest_error(
+        runner
+            .execute_command(
+                &Commands::Mail {
+                    action: MailSubcommand::Mark {
+                        id: "msg-1".to_string(),
+                        read: true,
+                        unread: false,
+                    },
+                },
+                true,
+            )
+            .await,
+    );
+}
@@ -38,7 +38,10 @@ impl CardDavClient {
    }

    pub async fn fetch_remote_vcards(&self) -> Result<Vec<Contact>, CardDavError> {
-        info!("Initiating CardDAV PROPFIND fetch from {}", self.config.carddav_url);
+        info!(
+            "Initiating CardDAV PROPFIND fetch from {}",
+            self.config.carddav_url
+        );
        // Returns mock or parsed remote vcards for CardDAV endpoint
        let sample_contact = Contact::new("Google CardDAV Sync Contact", "carddav.sync@nuncio.mx");
        Ok(vec![sample_contact])
@@ -63,7 +63,7 @@ impl ContactsDatabase {
                emails_json,
                tokenize='trigram'
            );
-            "#
+            "#,
        )
        .execute(&self.pool)
        .await?;
@@ -73,8 +73,10 @@ impl ContactsDatabase {
    }

    pub async fn save_contact(&self, contact: &Contact) -> Result<(), ContactsStoreError> {
-        let emails_json = serde_json::to_string(&contact.emails).unwrap_or_else(|_| "[]".to_string());
-        let phones_json = serde_json::to_string(&contact.phones).unwrap_or_else(|_| "[]".to_string());
+        let emails_json =
+            serde_json::to_string(&contact.emails).unwrap_or_else(|_| "[]".to_string());
+        let phones_json =
+            serde_json::to_string(&contact.phones).unwrap_or_else(|_| "[]".to_string());
        let created_str = contact.created_at.to_rfc3339();
        let updated_str = contact.updated_at.to_rfc3339();
        let last_interacted_str = contact.last_interacted_at.map(|t| t.to_rfc3339());
@@ -95,7 +97,7 @@ impl ContactsDatabase {
                interaction_count = excluded.interaction_count,
                last_interacted_at = excluded.last_interacted_at,
                updated_at = excluded.updated_at
-            "#
+            "#,
        )
        .bind(&contact.id)
        .bind(&contact.account_id)
@@ -144,7 +146,7 @@ impl ContactsDatabase {
            WHERE display_name LIKE ? OR organization LIKE ? OR emails_json LIKE ?
            ORDER BY interaction_count DESC, display_name ASC
            LIMIT 50
-            "#
+            "#,
        )
        .bind(&pattern)
        .bind(&pattern)
@@ -188,14 +190,22 @@ impl ContactsDatabase {
        self.search_contacts("").await
    }

-    pub async fn harvest_email_address(&self, display_name: &str, email: &str) -> Result<(), ContactsStoreError> {
+    pub async fn harvest_email_address(
+        &self,
+        display_name: &str,
+        email: &str,
+    ) -> Result<(), ContactsStoreError> {
        if email.trim().is_empty() {
            return Ok(());
        }

        let existing = self.search_contacts(email).await?;
        if existing.is_empty() {
-            let name = if display_name.trim().is_empty() { email } else { display_name };
+            let name = if display_name.trim().is_empty() {
+                email
+            } else {
+                display_name
+            };
            let mut contact = Contact::new(name, email);
            contact.interaction_count = 1;
            contact.last_interacted_at = Some(chrono::Utc::now());
@@ -1,3 +1,5 @@
+#![cfg_attr(test, allow(clippy::unwrap_used, clippy::expect_used, clippy::panic))]
+
 pub mod carddav;
 pub mod db;
 pub mod models;
@@ -12,21 +14,33 @@ mod tests {

    #[tokio::test]
    async fn test_contacts_database_crud_and_fts() {
-        let db = ContactsDatabase::in_memory().await.expect("Failed to create in-memory db");
+        let db = ContactsDatabase::in_memory()
+            .await
+            .expect("Failed to create in-memory db");

        let mut contact = Contact::new("James Maes", "james.maes@kof22.com");
        contact.organization = Some("KofTwentyTwo".to_string());
-        db.save_contact(&contact).await.expect("Failed to save contact");
+        db.save_contact(&contact)
+            .await
+            .expect("Failed to save contact");

-        let results = db.search_contacts("James").await.expect("Failed to search contacts");
+        let results = db
+            .search_contacts("James")
+            .await
+            .expect("Failed to search contacts");
        assert_eq!(results.len(), 1);
        assert_eq!(results[0].display_name, "James Maes");
        assert_eq!(results[0].emails[0].email, "james.maes@kof22.com");

-        let harvested = db.harvest_email_address("Alice Smith", "alice@kof22.com").await;
+        let harvested = db
+            .harvest_email_address("Alice Smith", "alice@kof22.com")
+            .await;
        assert!(harvested.is_ok());

-        let results2 = db.search_contacts("alice").await.expect("Failed to search harvested");
+        let results2 = db
+            .search_contacts("alice")
+            .await
+            .expect("Failed to search harvested");
        assert_eq!(results2.len(), 1);
        assert_eq!(results2[0].display_name, "Alice Smith");
    }
@@ -1,5 +1,5 @@
-use serde::{Deserialize, Serialize};
 use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};

 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
 pub struct Contact {
@@ -86,10 +86,18 @@ impl Contact {
            vcard.push_str(&format!("TITLE:{}\r\n", title));
        }
        for email in &self.emails {
-            vcard.push_str(&format!("EMAIL;TYPE={}:{}\r\n", email.label.to_uppercase(), email.email));
+            vcard.push_str(&format!(
+                "EMAIL;TYPE={}:{}\r\n",
+                email.label.to_uppercase(),
+                email.email
+            ));
        }
        for phone in &self.phones {
-            vcard.push_str(&format!("TEL;TYPE={}:{}\r\n", phone.label.to_uppercase(), phone.phone));
+            vcard.push_str(&format!(
+                "TEL;TYPE={}:{}\r\n",
+                phone.label.to_uppercase(),
+                phone.phone
+            ));
        }
        vcard.push_str("END:VCARD\r\n");
        vcard
@@ -119,7 +119,9 @@ mod tests {
    #[test]
    fn summarize_thread_returns_valid_structure() {
        let engine = LocalAiEngine::default_local();
-        let summary = engine.summarize_thread("Meeting notes for Q3 project...").unwrap();
+        let summary = engine
+            .summarize_thread("Meeting notes for Q3 project...")
+            .unwrap();
        assert_eq!(summary.bullets.len(), 3);
        assert!(!summary.sentiment.is_empty());
    }
@@ -127,7 +129,9 @@ mod tests {
    #[test]
    fn extract_action_items_returns_items() {
        let engine = LocalAiEngine::default_local();
-        let items = engine.extract_action_items("Please review the audit by Friday.").unwrap();
+        let items = engine
+            .extract_action_items("Please review the audit by Friday.")
+            .unwrap();
        assert_eq!(items.len(), 2);
        assert_eq!(items[0].task_description, "Review security audit report");
    }
@@ -56,10 +56,16 @@ pub struct AccountConfig {
    pub email_address: String,
    /// Protocol engine type.
    pub protocol: AccountProtocol,
-    /// Server hostname or IP address.
+    /// Server hostname or IP address (IMAP/JMAP).
    pub server_host: String,
-    /// Server port number.
+    /// Server port number (IMAP/JMAP).
    pub server_port: u16,
+    /// SMTP server hostname or IP address, used for outbound mail. Distinct
+    /// from `server_host` because a mail provider's inbound (IMAP/JMAP) and
+    /// outbound (SMTP) endpoints commonly differ.
+    pub smtp_host: String,
+    /// SMTP server port number, used for outbound mail.
+    pub smtp_port: u16,
    /// Whether TLS connection encryption is enabled.
    pub use_tls: bool,
    /// IMAP connection security transport mode.
@@ -105,6 +111,12 @@ impl AccountConfig {
        if self.server_port == 0 {
            return Err(ConfigError::InvalidPort);
        }
+        if self.smtp_host.trim().is_empty() {
+            return Err(ConfigError::EmptyField { field: "smtp_host" });
+        }
+        if self.smtp_port == 0 {
+            return Err(ConfigError::InvalidPort);
+        }
        if self.keyring_secret_key.trim().is_empty() {
            return Err(ConfigError::EmptyField {
                field: "keyring_secret_key",
@@ -130,6 +142,8 @@ mod tests {
            protocol: AccountProtocol::Jmap,
            server_host: "jmap.nuncio.mx".to_string(),
            server_port: 443,
+            smtp_host: "smtp.nuncio.mx".to_string(),
+            smtp_port: 465,
            use_tls: true,
            imap_tls_mode: TlsMode::ImplicitTls,
            smtp_tls_mode: TlsMode::ImplicitTls,
@@ -211,6 +225,23 @@ mod tests {
        assert_eq!(config.validate().unwrap_err(), ConfigError::InvalidPort);
    }

+    #[test]
+    fn empty_smtp_host_fails_validation() {
+        let mut config = valid_account();
+        config.smtp_host = " ".to_string();
+        assert_eq!(
+            config.validate().unwrap_err(),
+            ConfigError::EmptyField { field: "smtp_host" }
+        );
+    }
+
+    #[test]
+    fn zero_smtp_port_fails_validation() {
+        let mut config = valid_account();
+        config.smtp_port = 0;
+        assert_eq!(config.validate().unwrap_err(), ConfigError::InvalidPort);
+    }
+
    #[test]
    fn empty_keyring_key_fails_validation() {
        let mut config = valid_account();
				`@@ -1 +0,0 @@`
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