Four read-only, service-token-protected MCP provider endpoints (operations summary, attention vehicles, vehicle details, knowledge search facade). Shared-secret auth reusing the M4 callback pattern. Service-request audit trail for every call. Extracted shared operations-summary logic out of the dashboard router to avoid duplicating retrieval logic. 66 backend tests passing, ruff clean. Verified all four endpoints and audit trail directly via curl against the live stack (no live MCP Hub instance available in this environment).
Five rule scanners (duplicate customers, missing fields, odometer regression, booking overlap, status conflict) run automatically after seed and via an explicit scan endpoint. Issue defer/reject/merge-customers endpoints with transactional customer merge (booking rewiring, tombstone, audit). Data Quality nav + workbench UI with two-column duplicate comparison and inline (non-native) confirm. Dashboard attention items now link to issues. 35 backend tests passing, ruff clean. Fixed a real false-positive bug in odometer-regression detection found through iteration on seed data, and two TS narrowing errors. Verified end-to-end via browser: S2 merge and S4 overlap scenarios.
Transactional return command with idempotency, row-lock concurrency control, odometer-regression handling, vehicle status derivation, outbox event, audit trail. Result-summary UI on booking detail. 26 backend tests passing, ruff clean. Verified end-to-end via browser against S1 demo scenario; fixed two real defects found only through browser testing (UI state loss on status transition, unflushed UUID default).
NuklearRabbit