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.

api/schemas/state.py

@@ -9,6 +9,7 @@ from api.schemas.domain import DomainSummary
 from api.schemas.progress_event import ProgressEventRead
 from api.schemas.task import TaskRead
 from api.schemas.topic import TopicWithWorkstreams
+from api.schemas.suggestion import RankedSuggestionDigest
 from api.schemas.workstream import WorkstreamWithDeps
 
 
@@ -85,6 +86,7 @@ class StateSummary(BaseModel):
     contribution_counts: dict[str, int] = {}
     licence_risk_count: int = 0
     open_capability_requests: int = 0
+    ranked_suggestions: list[RankedSuggestionDigest] = []
 
 
 class DashboardWorkplanRow(BaseModel):