Phase 28-36 body of work

Accumulated since a6f12e2 (Phase 21 Rust port + Phase 27 versioning):

- Phase 36: embed_semaphore on VectorState (permits=1) serializes
  seed embed calls — prevents sidecar socket collisions under
  concurrent /seed stress load
- Phase 31+: run_stress.ts 6-task diverse stress scaffolding;
  run_e2e_rated.ts + orchestrator.ts tightening
- Catalog dedupe cleanup: 16 duplicate manifests removed; canonical
  candidates.parquet (10.5MB -> 76KB) + placements.parquet (1.2MB ->
  11KB) regenerated post-dedupe; fresh manifests for active datasets
- vectord: harness EvalSet refinements (+181), agent portfolio
  rotation + ingest triggers (+158), autotune + rag adjustments
- catalogd/storaged/ingestd/mcp-server: misc tightening
- docs: Phase 28-36 PRD entries + DECISIONS ADR additions;
  control-plane pivot banner added to top of docs/PRD.md (pointing
  at docs/CONTROL_PLANE_PRD.md which lands in next commit)

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

crates/gateway/src/tools/registry.rs

@@ -103,7 +103,7 @@ impl ToolRegistry {
                     ParamDef { name: "limit".into(), param_type: "integer".into(), required: false, description: "Max results".into(), default: Some(serde_json::json!(20)) },
                 ],
                 returns: "List of candidates with id, name, phone, email, skills, experience".into(),
-                sql_template: "SELECT candidate_id, first_name, last_name, phone, email, city, state, zip, vertical, skills, years_experience FROM candidates WHERE 1=1 {skills_filter} {city_filter} {state_filter} {years_filter} {status_filter} ORDER BY years_experience DESC LIMIT {limit}".into(),
+                sql_template: "SELECT candidate_id, first_name, last_name, phone, email, city, state, skills, years_experience, status FROM candidates WHERE 1=1 {skills_filter} {city_filter} {state_filter} {years_filter} {status_filter} ORDER BY years_experience DESC LIMIT {limit}".into(),
                 category: "candidates".into(),
             },
             ToolDef {