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>

data/_catalog/manifests/f2fda821-2f86-4c81-af58-488d184d8243.json

@@ -0,0 +1,47 @@
+{
+  "id": "f2fda821-2f86-4c81-af58-488d184d8243",
+  "name": "resumes",
+  "schema_fingerprint": "a2b2c191412faf317800637da5887d30d749d5ba0222d0a8edd12cde08daeb8a",
+  "objects": [
+    {
+      "bucket": "primary",
+      "key": "datasets/resumes.parquet",
+      "size_bytes": 3159,
+      "created_at": "2026-04-19T11:26:29.607950059Z"
+    }
+  ],
+  "created_at": "2026-04-19T11:26:29.607951447Z",
+  "updated_at": "2026-04-19T11:26:29.608054435Z",
+  "description": "",
+  "owner": "",
+  "sensitivity": null,
+  "columns": [
+    {
+      "name": "doc_id",
+      "data_type": "Utf8",
+      "sensitivity": null,
+      "description": "",
+      "is_pii": false
+    },
+    {
+      "name": "resume_text",
+      "data_type": "Utf8",
+      "sensitivity": null,
+      "description": "",
+      "is_pii": false
+    }
+  ],
+  "lineage": {
+    "source_system": "ndjson",
+    "source_file": "resumes.ndjson",
+    "ingest_job": "ingest-1776597989607",
+    "ingest_timestamp": "2026-04-19T11:26:29.607950059Z",
+    "parent_datasets": []
+  },
+  "freshness": null,
+  "tags": [],
+  "row_count": 10,
+  "last_embedded_at": null,
+  "embedding_stale_since": null,
+  "embedding_refresh_policy": null
+}