# Step 4 MVP Triage — Completion Walkthrough

## Change Made

**One file modified:**

- [README.md](file:///g:/.vibe/XZBT-NGN/test-fixtures/reference-exhibits/README.md) — Added a 6-line blockquote copy-notice header at the top of the file, before the existing upstream README content. The header:
  - Identifies this as a locally corrected copy
  - Points to `../PROVENANCE.md` for correction details
  - Warns that re-copying from upstream without reapplying corrections will reintroduce known defects
  - Does not modify any of the original upstream README body

## Validation

| Check | Result |
| --- | --- |
| `git diff --check` | ✅ Clean (exit 0) |
| `python devlog_editor.py --validate` | ✅ "devlog is valid" |

## Triage Summary

| Finding | Classification | Action Taken |
| --- | --- | --- |
| F-1 `INVALID_ARGUMENTS` | Not actually a defect — §9.5 mandates `INVALID_VALUE` | None needed |
| F-2 Descriptor validation | Safe to defer — permissive but conformant | Deferred to restore milestone |
| F-3 README framing | Should fix now — evidence-integrity risk | **Applied** |
| F-4 Browser evidence | Informational only | None needed |
| F-5 `stateRevision` session persistence | Informational only — already in Authoring Guide | None needed |

## Next Steps

- No commit or push was performed (per AGENTS.md rules)
- The milestone verdict can now be changed to: **STEP 4 MVP COMPLETE — READY FOR NEXT STEP 4 PHASE**
- New application files remain untracked until the owner requests staging/commit