ci: retire migrated legacy RC coordinator (#6)

All 33 active default-branch RC callers now use the pinned orb-owned worker. Remove the duplicate release implementation after passing caller migrations and verified Alerts RC.17 recovery.

Co-authored-by: Codex <noreply@openai.com>

.circleci/config.yml

@@ -1,18 +0,0 @@
-# The org's CircleCI GitHub App builds every repository; without a config this repository
-# reported "No configuration was found" as an error on every commit. Lint the workflows instead.
-version: 2.1
-
-jobs:
-  actionlint:
-    docker:
-      - image: cimg/go:1.24
-    steps:
-      - checkout
-      - run:
-          name: Lint GitHub Actions workflows
-          command: go run github.com/rhysd/actionlint/cmd/actionlint@v1.7.7 -color .github/workflows/*.yml
-
-workflows:
-  lint:
-    jobs:
-      - actionlint

.github/workflows/qbit-release-rc.yml

@@ -1,73 +0,0 @@
-# Cut the next release candidate of a qbit (QRun-IO/qqq docs/QRUN-QBIT-REPO-STANDARD.md, C6).
-#
-# Called from each qbit's .github/workflows/release-rc.yml on a manual dispatch or when a
-# develop PR labelled `release:rc` is merged. It merges develop into the release line through
-# the GitHub API (GitHub signs the merge commit), and the push of release/* runs the existing
-# CircleCI publish_release_candidate workflow (qqq-orb: RC bump, Maven Central, tag). Nothing
-# here publishes, tags or touches hotfix/* branches.
-#
-# Release line: develop's <revision>X.Y.Z-SNAPSHOT</revision> picks release/X.Y.Z if that branch
-# exists, else release/X.Y (created from develop when missing).
-name: qbit release candidate
-
-on:
-  workflow_call:
-    inputs:
-      dry_run:
-        description: Print the plan without merging or creating branches
-        type: boolean
-        default: false
-
-permissions:
-  contents: write
-
-jobs:
-  cut-rc:
-    runs-on: ubuntu-24.04
-    timeout-minutes: 10
-    concurrency:
-      group: qbit-release-rc-${{ github.repository }}
-      cancel-in-progress: false
-    steps:
-      - name: Merge develop into the release line
-        env:
-          GH_TOKEN: ${{ github.token }}
-          REPO: ${{ github.repository }}
-          DRY_RUN: ${{ inputs.dry_run }}
-        run: |
-          set -euo pipefail
-          develop_sha=$(gh api "repos/$REPO/branches/develop" -q .commit.sha)
-          revision=$(gh api "repos/$REPO/contents/pom.xml?ref=$develop_sha" -q .content | base64 -d \
-            | sed -n 's:.*<revision>\(.*\)</revision>.*:\1:p' | head -n 1)
-          if [[ ! "$revision" =~ ^([0-9]+)\.([0-9]+)\.([0-9]+)-SNAPSHOT$ ]]; then
-            echo "::error::develop pom.xml <revision> must be X.Y.Z-SNAPSHOT, found '$revision'"
-            exit 1
-          fi
-          full="${BASH_REMATCH[1]}.${BASH_REMATCH[2]}.${BASH_REMATCH[3]}"
-          line="${BASH_REMATCH[1]}.${BASH_REMATCH[2]}"
-          branch_exists() { gh api "repos/$REPO/branches/$1" --silent 2>/dev/null; }
-          if branch_exists "release/$full"; then branch="release/$full"
-          elif branch_exists "release/$line"; then branch="release/$line"
-          else branch=""; fi
-
-          if [[ -z "$branch" ]]; then
-            branch="release/$line"
-            echo "Plan: create $branch from develop $develop_sha (first RC of $full)"
-            [[ "$DRY_RUN" == true ]] && exit 0
-            gh api "repos/$REPO/git/refs" -f ref="refs/heads/$branch" -f sha="$develop_sha" --silent
-          else
-            echo "Plan: merge develop $develop_sha into $branch"
-            [[ "$DRY_RUN" == true ]] && exit 0
-            # 201 merged, 204 already up to date (nothing new to release), 409 conflict.
-            response=$(gh api --include "repos/$REPO/merges" -f base="$branch" -f head="$develop_sha" \
-              -f commit_message="Merge develop into $branch for the next $full RC" 2>&1) || true
-            status=$(printf '%s\n' "$response" | sed -n 's:^HTTP/[0-9.]* \([0-9][0-9]*\).*:\1:p' | head -n 1)
-            case "$status" in
-              201) ;;
-              204) echo "::warning::$branch already contains develop; no new RC"; exit 0 ;;
-              409) echo "::error::Merge conflict between develop and $branch; resolve it in a PR into $branch"; exit 1 ;;
-              *) echo "::error::Merge of develop into $branch failed (HTTP ${status:-unknown})"; exit 1 ;;
-            esac
-          fi
-          echo "Pushed $branch; CircleCI publish_release_candidate cuts the RC." >> "$GITHUB_STEP_SUMMARY"
-          echo "Release line: $branch" >> "$GITHUB_STEP_SUMMARY"

.github/workflows/workflow-lint.yml

@@ -0,0 +1,14 @@
+name: Workflow lint
+'on':
+  push:
+    branches:
+    - '**'
+  pull_request: null
+  workflow_dispatch: null
+permissions:
+  contents: read
+jobs:
+  actionlint:
+    uses: QRun-IO/qqq-orb/.github/workflows/workflow-lint.yml@0f33ddadf88b9a1b940b8883782fe2000ee1d2bd
+    if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name
+      != github.repository