Implements task ID integrity detection across the stack (FN-4192): a new `task-id-integrity` module in core provides detector logic wired into the store, integrity health is surfaced via the dashboard API and legacy endpoint, and a banner component surfaces alerts in the UI — backed by comprehensive
Fusion-Task-Id: FN-4192
Adds database health endpoints to the API layer (FN-4029), exposing a new store health accessor through `api-node.ts` and `api/legacy.ts`, with aligned auth middleware integration tests and updated architecture documentation.
Fusion-Task-Id: FN-4029
Exposes database health status via the API by deferring integrity checks asynchronously, with docs and tests covering the core DB layer, store integration, and dashboard server health endpoint.
Fusion-Task-Id: FN-4025
This merge introduces canonical mock helper modules across the dashboard and engine packages, and migrates representative test suites to use them for consistency. The changes add four new mock helpers (`mockApi.ts`, `mockLucide.ts`, `mockCore.ts`, `mockCoreEngine.ts`) and harden the API mock proxy's
Fusion-Task-Id: FN-3044