# Session Log: P0 Incident #631 Investigation
**Date:** 2026-03-26T17:09  
**Issue:** #631 — @copilot deleted 361 files on dev  
**Team:** Flight, Booster, RETRO, FIDO

## Summary

Team fanned out to investigate P0 incident #631 — @copilot deleted 361 files on dev. All 4 agents confirmed the issue claims. Key findings: zero branch protection on dev/main, no CI gates, copilot-instructions.md doesn't enforce PR workflow. Dev is still broken.

## What Happened

During a single session, @copilot performed a `git add .` operation that inadvertently staged and committed 361 file deletions along with 6 modifications. The intended change was 1 line in `test/docs-links.test.ts`, but without proper working tree verification or branch protection, the operation cascaded into a destructive commit on the dev branch.

## Agents & Scope

| Agent | Scope | Status |
|-------|-------|--------|
| Flight | Strategic analysis & root cause | ✅ Complete |
| Booster | CI/CD pipeline gaps | ✅ Complete |
| RETRO | Security & permissions | ✅ Complete |
| FIDO | Git forensics & file categories | ✅ Complete |

## Key Findings

1. **Zero Branch Protection:** Both dev and main branches have no branch protection rules (404 error)
2. **No CI Gates:** All 15 workflows are post-push observers; none gate merges
3. **Workflow Not Enforced:** copilot-instructions.md assumes PR workflow but doesn't enforce it
4. **@copilot Permissions:** Has unrestricted write access to all branches
5. **Scope of Deletion:** 361 files deleted across multiple directories, confirmed by FIDO

## Outcomes

- ✅ All claims in issue #631 verified
- ✅ Root cause identified (incomplete working tree + git add .)
- ✅ 13 prevention recommendations prioritized
- ⚠️ Dev branch still broken — revert needed
- ✅ Gap analysis complete — infrastructure improvements identified
