M20: complete production acceptance

PROJECT_STATE.md

@@ -2480,3 +2480,26 @@ evidence yet."
   and mypy are clean.
 - Exact next action: commit and deploy this milestone, run complete Playwright and visual
   acceptance against Unraid, refresh final evidence, push and verify the live hash.
+
+## M20 — final production acceptance and hand-off (2026-08-10)
+
+- Tightened RAGcore citation identity to title plus named section. Multiple chunks from
+  the same unsectioned document now render as one source card, while distinct named
+  sections remain independently citable.
+- Stabilized acceptance selectors around persistent business identity instead of table
+  position: the guided demo filters for the generated MO-024 odometer issue, vehicle
+  attention checks use semantic reason markers, and reassigned work verifies the exact
+  captured issue reference after the queue reorders.
+- Validation evidence: targeted knowledge **31 passed**; complete isolated PostgreSQL
+  backend **225 passed, 1 dependency warning**; complete live production Playwright
+  **145 passed in 4.4 minutes**. The live visual audit covered desktop dashboard, mobile
+  data-quality, Integration Management and a grounded RAGcore exchange without overlap
+  or horizontal page overflow.
+- Live hand-off: readiness is `ready`; migration is `f43d829ab610 (head)`; API, database
+  and web containers are healthy. Reset restored all scenarios with the canonical 2 / 180
+  / 50 / 254 / 75 / 40 / 33 / 20 entity counts. Central n8n, MCP Hub and RAGcore all
+  report operational/available; no separate n8n was started.
+- Recovery evidence: verified live backup
+  `/mnt/user/appdata/mobilityops/backups/postgres/mobilityops-20260810T111913Z.dump`.
+- Exact next action: none for the locked PoC. Routine operation, monitoring and any scope
+  expansion require a separate approved milestone.