# DISPATCH — Reviewer 1 (Milestone M4: Concat Architecture & Audio Continuity)

## Mission
You are Reviewer 1 for Milestone M4 Gate Verification.
Examine the implementation of audio-preserving FFmpeg concat and Mode A timeline continuity in:
- `05_Production_Pipeline/production_orchestrator.py`:
  * `concat_scene_shots`: check default `mode="boundary_smoothing"` (Mode A: 30ms micro-fade with `curve=qsin`) preventing audio duration loss.
  * Check silent video fallback in fallback concat path (`aevalsrc=0`).
  * Check `--mode` CLI argument.
- `05_Production_Pipeline/audio_continuity_engine.py`.
- Run verification tests:
  * `python -m pytest tests/test_production_pipeline_m4.py -v`
  * `python -m pytest tests/test_adversarial_m3_audio_engine.py -v`
- Inspect code quality, error handling, and conformance to `AGENTS.md §4`.
- Deliver your formal review verdict (APPROVE or REQUEST_CHANGES) in:
  `c:\Projects\KieuStory\.agents\teamwork\reviewer_m4_1\handoff.md`.
- Notify parent orchestrator when complete.

## 2026-10-09T08:12:32Z
You are Reviewer 1 for Milestone M4 Gate Verification.

Your working directory is: c:\Projects\KieuStory\.agents\teamwork\reviewer_m4_1

MANDATORY FIRST STEP:
Read c:\Projects\KieuStory\.agents\teamwork\ORIGINAL_REQUEST.md completely. Do not skip this.
Read c:\Projects\KieuStory\.agents\teamwork\orchestrator_1\PROJECT.md.
Read c:\Projects\KieuStory\.agents\teamwork\worker_m4_assembly_1\handoff.md.
Read c:\Projects\KieuStory\.agents\teamwork\reviewer_m4_1\DISPATCH.md.

REVIEW INSTRUCTIONS:
1. Review concat_scene_shots in 05_Production_Pipeline/production_orchestrator.py:
   - Verify default mode="boundary_smoothing" (Mode A: 30ms micro-fade with curve=qsin).
   - Verify zero timeline duration loss across multi-shot scenes.
   - Verify silent video fallback handling (aevalsrc=0) in fallback concat path.
   - Verify --mode CLI argument.
2. Review test suites:
   - python -m pytest tests/test_production_pipeline_m4.py -v
   - python -m pytest tests/test_adversarial_m3_audio_engine.py -v
3. Inspect code quality and verify AGENTS.md §4 compliance (100% zero OpenCV concat).
4. Deliver your formal review verdict (APPROVE or REQUEST_CHANGES) in:
   c:\Projects\KieuStory\.agents\teamwork\reviewer_m4_1\handoff.md.
5. Send a completion message to parent orchestrator.