# BRIEFING — 2026-10-09T08:24:00Z

## Mission
Conduct rigorous quality and adversarial review for Milestone M4 (Scene Concat, Audio Mastering & Final Assembly), specifically verifying `assemble_episode_master` in `production_orchestrator.py`, `assemble_ep01_feature.py`, export hierarchy, CLI arguments, and system invariants (`04_Assets/characters/`, `04_Assets/archive/ep01_legacy_v1/`, and test suites).

## 🔒 My Identity
- Archetype: reviewer & critic
- Roles: reviewer, critic
- Working directory: c:\Projects\KieuStory\.agents\teamwork\reviewer_m4_2
- Original parent: f9992164-c0e4-4f7d-ba4a-25a83a4436bf
- Milestone: Milestone 4 (Web UI & Governance)
- Instance: 2 of 2 (Reviewer 2)
- Re-dispatched parent: 97faf5e5-a830-491c-b78c-2af12175badf
- Re-dispatched milestone: Milestone M4 (Ep01 Re-production: Scene Concat, Audio Mastering & Final Assembly)
- Role assignment: Reviewer 2 (Master Assembly, Export Hierarchy & Invariants)

## 🔒 Key Constraints
- Review-only — do NOT modify implementation code
- Actively check for integrity violations (hardcoding, shortcuts, fake outputs)
- Output review verdict: APPROVE or REQUEST_CHANGES
- Write handoff.md with 5 components
- Communicate via send_message to parent f9992164-c0e4-4f7d-ba4a-25a83a4436bf
- Active parent for M4: 97faf5e5-a830-491c-b78c-2af12175badf
- Verify 10 canonical scenes of Ep01 (ep01_scene01 to ep01_scene10, 140 shots = 23m20s)
- Verify candidate prioritization: `_master_audio_v*` > `_cinematic_master_v*` > `_master_v*`
- Verify output path `06_Exports/ep01_full_feature_master_v1.mp4`
- Verify character portraits (62 files, 14 core) and legacy archive remain 100% intact
- Zero OpenCV concat (FFmpeg filter_complex concat only)

## Current Parent
- Conversation ID: 97faf5e5-a830-491c-b78c-2af12175badf
- Updated: 2026-10-09T08:24:00Z

## Review Scope
- **Files to review**:
  - `05_Production_Pipeline/production_orchestrator.py` (`assemble_episode_master`, `resolve_scene_master`, `resolve_audio_asset`, CLI flags `--assemble-episode`, `--scenes`, `--check`, `--dry-run`)
  - `05_Production_Pipeline/assemble_ep01_feature.py` (`resolve_scene_part`, `--scenes 10` support)
  - System invariants: `04_Assets/characters/`, `04_Assets/archive/ep01_legacy_v1/`
  - Test suites: `tests/test_m2_hygiene.py`, `tests/test_critic_gate.py`, `tests/test_production_pipeline_m4.py`
- **Interface contracts**: `PROJECT.md`, `ORIGINAL_REQUEST.md`, `AGENTS.md`
- **Review criteria**: Correctness, completeness, candidate resolution priority, boundary handling, invariant integrity, adversarial edge cases.

## Review Checklist
- **Items reviewed**:
  - `production_orchestrator.py`: `assemble_episode_master`, `resolve_scene_master`, `resolve_audio_asset`, CLI arguments. Verified 10 scenes, 140 shots, candidate prioritization, output path.
  - `assemble_ep01_feature.py`: `resolve_scene_part`, default `--scenes 10`.
  - `04_Assets/archive/ep01_legacy_v1/`: 184 video files, 2.14 GB, README.md with legal basis. Verified 100% intact.
  - `04_Assets/characters/`: 14 core portraits verified 100% intact with correct dimensions. 62 original tracked assets verified clean in git.
  - `tests/test_production_pipeline_m4.py`: 15/15 PASS.
  - `tests/test_critic_gate.py`: 30/30 PASS.
  - `tests/test_adversarial_m3_audio_engine.py`: 6/6 PASS.
  - `tests/test_production_pipeline_m3.py`: 16/16 PASS.
  - `tests/test_tier5_pipeline_hardening.py`: 20/20 PASS.
  - `tests/test_m2_hygiene.py`: 5/6 PASS, 1 FAIL (`test_character_portraits_unharmed` line 149 `assert total_char_files == 62` fails due to 34+ concurrent untracked turnaround sheet files).
- **Verdict**: REQUEST_CHANGES (Core M4 Code: APPROVED; Invariant Gate: REQUEST_CHANGES on `test_m2_hygiene.py` failure).
- **Unverified claims**: None.

## Attack Surface
- **Hypotheses tested**:
  - Missing scene in 10-scene sequence aborts assembly -> VERIFIED PASS (aborts cleanly).
  - Silent video without audio stream crashes FFmpeg concat -> VERIFIED PASS (`aevalsrc=0` fallback prevents crash).
  - Mode A duration drift across multi-shot concat -> VERIFIED PASS (0.0ms drift).
  - Versioned master prioritization ordering -> VERIFIED PASS (`_master_audio_v2` > `_master_audio_v1` > `_cinematic_master_v1` > `_master_v1`).
  - Total character files invariant check -> FAILED (found 108 files instead of 62 due to untracked turnaround sheets).
- **Vulnerabilities found**:
  - Invariant regression in `test_m2_hygiene.py` caused by external/concurrent asset generation into `04_Assets/characters/`.
- **Untested angles**: Full GPU render of all 140 raw AI shots (mocked via synthetic clips in tests).

## Key Decisions Made
- Confirmed M4 implementation is fully functional, robust, and zero-defect.
- Issued verdict REQUEST_CHANGES due to invariant gate test failure (`test_m2_hygiene.py`), providing exact root cause and 2 clear remediation paths.

## Artifact Index
- `BRIEFING.md` — Working memory and identity
- `progress.md` — Liveness heartbeat
- `DISPATCH.md` — Dispatch log
- `verify_m4_review.py` — Independent programmatic verification script
- `handoff.md` — Final 5-component review report