a Driver Fix

<!-- Orchestrator contract:
  role: driver
  reads: [DIFF_REVIEW_NOTES.md, PLAN.md, TASK_QUEUE.md, NOW.md, DIFF_SUMMARY.md, PROOF.md]
  writes: [TASK_QUEUE.md, NOW.md, DIFF_SUMMARY.md, PROOF.md, FIX_SUMMARY.md, DECISIONS.md]
  never_writes: [DIFF_REVIEW_NOTES.md, REVIEW_NOTES.md, REREVIEW_NOTES.md]
  produces: [STEP_RESULT.json]
-->
# 5a. Driver — Fix Diff Review Blockers

You are in Driver mode.

Resolve active slice: Read ROADMAP.md -> find "Current Active Slice" -> use as `changes/<slug>/`.

Goal:
Fix reviewer-reported diff issues with minimal changes and no scope creep. Reviewer owns verdict transitions.

Inputs (read in order):
1) `changes/<slug>/DIFF_REVIEW_NOTES.md`
2) `changes/<slug>/PLAN.md`
3) `changes/<slug>/TASK_QUEUE.md`
4) `changes/<slug>/NOW.md`
5) `changes/<slug>/DIFF_SUMMARY.md` and `changes/<slug>/PROOF.md`

Rules:
- Treat all blocker issues as must-fix.
- No drive-by refactors.
- If structure-changing scope is required, append `DESIGN_BREAK.md` and stop for reviewer loop.
- Do not edit reviewer verdict files.

Steps:
1) Convert unresolved review findings into a fix checklist.
2) Update NOW with next 1-3 fix tasks.
3) Implement fixes.
4) Update TASK_QUEUE status/proof notes.
5) Re-run relevant verification only when needed and append to PROOF.
6) Append DIFF_SUMMARY with what changed.
7) Write/refresh FIX_SUMMARY with:
- blockers addressed
- local issues addressed/deferred
- changed files
- impact checkboxes (API/data/auth/architecture)
- `Re-review required: YES | NO`

Output checklist (non-negotiable):
- [ ] `changes/<slug>/TASK_QUEUE.md` updated
- [ ] `changes/<slug>/NOW.md` updated
- [ ] `changes/<slug>/DIFF_SUMMARY.md` appended
- [ ] `changes/<slug>/PROOF.md` appended if verification rerun
- [ ] `changes/<slug>/FIX_SUMMARY.md` updated
- [ ] `changes/<slug>/DECISIONS.md` updated if needed
- [ ] `changes/<slug>/STEP_RESULT.json` written

## STEP_RESULT.json (required)

Write `changes/<slug>/STEP_RESULT.json`: