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/scenario-2026-04-21T01-35-26/results.json

@@ -0,0 +1,30 @@
+[
+  {
+    "event": {
+      "kind": "baseline_fill",
+      "at": "14:00",
+      "role": "Quality Tech",
+      "count": 1,
+      "city": "Toledo",
+      "state": "OH",
+      "shift_start": "14:00 AM"
+    },
+    "ok": true,
+    "fills": [
+      {
+        "candidate_id": "45337",
+        "name": "Carolyn T. Cox"
+      }
+    ],
+    "turns": 3,
+    "duration_secs": 25.066,
+    "gap_signals": [
+      "artifact: undefined is not an object (evaluating 'f.reason.slice')"
+    ],
+    "sources_first_score": 0.7026848,
+    "sources_last_score": 0.6469463,
+    "pool_size": 701,
+    "playbook_citations": [],
+    "discovered_pattern": "Across 25 similar past playbooks (14 workers examined) · recurring certifications: OSHA-10 (64%) · archetype mostly: flexible · reliability median 0.89 (range 0.59–1.00)"
+  }
+]