docs: PHASES tracker — mark Phases 42/43/44/45 complete

Today's work shipped four Phase closures (Truth Layer, Validation
Pipeline, Caller Migration, Doc-Drift Detection); the canonical
tracker now reflects them. Foundation for production switchover
(real Chicago data replaces synthetic test data soon).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/PHASES.md

@@ -349,6 +349,24 @@
   - Per-type endpoints: `/profiles/retrieval`, `/profiles/memory`, `/profiles/observer`
   - `profile_type` field on ModelProfile
   - Guard fix: automated scrumaudit.py finds real issues
+- [x] **Phase 42: Truth Layer** (2026-04-27 closure verified)
+  - `crates/truth/{lib,staffing,devops,loader}.rs`
+  - Staffing rules populated; devops scaffold by design
+  - `/v1/context` serves task_classes + rules; 37 tests green
+- [x] **Phase 43: Validation Pipeline** (2026-04-27)
+  - `crates/validator/` real validators + WorkerLookup + ParquetWorkerLookup
+  - 500K-row workers_500k.parquet loaded at gateway boot
+  - `POST /v1/validate` + `POST /v1/iterate` (the 0→85% loop)
+  - 33 validator tests green
+- [x] **Phase 44: Caller Migration** (2026-04-27)
+  - TS callers + aibridge::AiClient::new_with_gateway opt-in
+  - Vectord routed through /v1/chat for autotune + RAG
+  - scripts/check_phase44_callers.sh CI guard
+- [x] **Phase 45: Doc-Drift Detection** (2026-04-27)
+  - DocRef + doc_drift module + context7 bridge
+  - /doc_drift/check + /scan + /resolve endpoints
+  - data/_kb/doc_drift_corrections.jsonl writes
+  - boost exclusion of unreviewed drift-flagged entries
 - [ ] Fine-tuned domain models (Phase 25+)
 - [ ] Multi-node query distribution (only if ceilings bite)