feat(04-05): DevOverlay package + DevSnapshot/ToolCallRow in AgentOrchestrator (OBS-01)
- NSPanel-backed DevOverlayWindow (.floating + .nonactivating) hidden by default
- SwiftUI DevOverlayView renders OBS-01 surface: state/turn, provider/model,
token counts, cache creation/read + hit %, latency, last-5 tool calls
- @Observable @MainActor DevOverlayViewModel — single write path via apply()
- DevOverlayBridge pumps BoundedAsyncChannel<DevSnapshot> → ViewModel
- DevSnapshot + ToolCallRow live in AgentOrchestrator target (Rule 3
deviation from plan's files_modified: DevSnapshotEmitter consumes both
OrchestratorEvent and DevSnapshot, so parking both in AgentOrchestrator
avoids the circular AgentOrchestrator→DevOverlay→AgentOrchestrator dep)
- Additive OrchestratorEvent.usage(turnId:usage:) — surfaces TurnUsage to
DevOverlay without reading replay; no nonce (SEC-06 preserved)
- AgentOrchestrator now emits .usage on LLMEvent.usage alongside replay write
- 14 DevOverlay tests pass; 114 AgentCore tests pass (no regression)
james.maes
1aeec87682