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-2026-04-21T02-09-43/lesson.md

@@ -0,0 +1,6 @@
+# Cross-day lesson — Summit Industrial, 2026-05-08
+
+_Generated by `gpt-oss:20b` in 6.2s. Based on 2 events + 1 mid-day checkpoints._
+
+**  
+When a recurring shift precedes a baseline‑fill, pre‑fetch the candidate’s calendar for both slots to avoid double‑booking. Always populate the `f.reason` field for every assignment to prevent artifact errors. In this run, Sarah D. Cook was at risk; check her calendar before assigning her to the 13:00 shift. Keep pool counts and turns updated after each fill to maintain accurate metrics.