Finish CUST-WP-0011 and implement STATE-WP-0061 suggestion backlog.

Add persisted Suggestion entities with WSJF ranking, relevance bumps,
REST/MCP write surfaces, /suggestions dashboard page, and daily triage
digest integration. Document the cluster operating model, archive the
completed migration workplan, and seed WARDEN-WP-0012 routing scenarios.

infra/README.md

@@ -26,9 +26,14 @@ Operator runbook: [`docs/consistency-sweep-runbook.md`](../docs/consistency-swee
 
 **Prerequisites for cluster-triggered sweeps:**
 
-- Workstation State Hub API running (`make api` or equivalent)
-- `state-hub-railiance01` ops-bridge tunnel `connected`
-- Workstation awake (execution still runs locally; only scheduling moved)
+- Primary State Hub API reachable at `http://127.0.0.1:8000` (cluster via
+  `state-hub-primary` tunnel, or local `make api` during rollback)
+- `state-hub-railiance01` ops-bridge tunnel `connected` for Railiance01
+  activity-core triggers
+- Workstation awake when sweep writebacks target local repo paths
+
+See [`docs/cluster-operating-model.md`](../docs/cluster-operating-model.md) for
+the post-migration access model.
 
 Per-repo git post-commit hooks remain the immediate consistency path after
 each commit. The 15-minute sweep is belt-and-suspenders across all registered