chore: add real content that was sitting untracked

Surfaced by today's untracked-files audit. None of these are accidents —
multiple are referenced by name in CLAUDE.md and memory files but were
never added.

Categories:
- docs/PHASE_AUDIT_GUIDE.md (106 LOC) — Claude Code phase audit guidance
- ops/systemd/lakehouse-langfuse-bridge.service — Langfuse bridge unit
- package.json — top-level npm manifest
- scripts/e2e_pipeline_check.sh + production_smoke.sh — real test scripts
- reports/kimi/audit-last-week*.md — the "Two reports live" CLAUDE.md cites
- tests/multi-agent/scenarios/ — 44 staffing scenarios (cutover decision A)
- tests/multi-agent/playbooks/ — 102 playbook records
- tests/battery/, tests/agent_test/PRD.md, tests/real-world/* — real tests
- sidecar/sidecar/{lab_ui,pipeline_lab}.py — 888 LOC dev-only UIs that
  remain in service post-sidecar-drop (commit ba928b1 explicitly kept them)

Sensitivity check: scenarios use synthetic company names ("Heritage Foods",
"Cornerstone Fabrication"); audit reports describe code findings only;
no PII or secrets surfaced.

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

tests/multi-agent/playbooks/task-1776827284589-FAILED.json

@@ -0,0 +1,25 @@
+{
+  "task": {
+    "id": "task-1776827284589",
+    "operation": "fill: Welder x2 in Toledo, OH",
+    "target_role": "Welder",
+    "target_count": 2,
+    "target_city": "Toledo",
+    "target_state": "OH",
+    "approach_hint": "hybrid search against workers_500k_v1, narrow by role+city+state+availability, rank semantically"
+  },
+  "error": "no JSON object in executor response: {\"kind\":\"tool_call\",\"tool\":\"hybrid_search\",\"args\":{\"index_name\":\"workers_500k_v1\",\"sql_filter\":\"role = 'Welder' AND city = 'Toledo' AND state = 'OH' AND CAST(availability AS DOUBLE) >",
+  "log": [
+    {
+      "turn": 1,
+      "role": "executor",
+      "model": "qwen3.5:latest",
+      "kind": "error",
+      "content": {
+        "message": "no JSON object in executor response: {\"kind\":\"tool_call\",\"tool\":\"hybrid_search\",\"args\":{\"index_name\":\"workers_500k_v1\",\"sql_filter\":\"role = 'Welder' AND city = 'Toledo' AND state = 'OH' AND CAST(availability AS DOUBLE) >",
+        "raw": "{\"kind\":\"tool_call\",\"tool\":\"hybrid_search\",\"args\":{\"index_name\":\"workers_500k_v1\",\"sql_filter\":\"role = 'Welder' AND city = 'Toledo' AND state = 'OH' AND CAST(availability AS DOUBLE) >"
+      },
+      "at": "2026-04-22T03:08:31.492Z"
+    }
+  ]
+}