feat: finalize unified KB auth, eval tuning, and UI prompt updates

chore: prune stale eval artifacts and add repo hygiene cleanup tooling

Add release preflight, baseline gates, and review-queue observability

Remove Dan McDuffie assets and add FAQ fast-lane matching workflow

Integrate rag8 corpus and POTS intake template into canonical KB

Sync pending app, RAG, and evaluation updates

Import rag7 corpus docs into canonical RAG KB and rebuild ingestion artifacts

Import rag6 corpus into canonical RAG and rebuild ingestion artifacts

Improve unified KB speed/quality routing and add synonym pipeline

Speed up unified KB with deterministic fast paths, cache, and eval phase profiling

Speed up unified KB routing and lifecycle fast paths; rerun 150 eval in shards

Add unified KB eval150 runner, reports, and nightly CI

feat(router-rag): add semantic eval, citation gates, web budgets, alias growth; fix auth startup fallback

Harden backend test harness and stabilize router RAG retrieval

Improve router RAG battery/variant handling and ingest AER1600/AER2200 docs

Update router RAG corpus, ingestion artifacts, and gap reports