# HANDOFF REPORT — REVIEWER 2 (MILESTONE M4 GATE VERIFICATION)

## Review Summary

**Verdict**: REQUEST_CHANGES (Invariant Remediation Required)
- **M4 Core Engineering & Pipeline**: APPROVED (100% compliant with specifications, zero defects, 15/15 M4 tests PASS).
- **System Invariant Gate**: REQUEST_CHANGES due to failure of required test `tests/test_m2_hygiene.py` (5/6 PASS, 1 FAIL) caused by concurrent generation of 34+ untracked turnaround sheet files into `04_Assets/characters/`, violating the 62-file invariant check.

---

## 1. Observation

### 1.1 Implementation Codebase
- **`05_Production_Pipeline/production_orchestrator.py`**:
  * Line 1001-1036: `resolve_audio_asset(asset_name_or_path)` searches direct path, `04_Assets/audio/`, `04_Assets/audio_sfx/`, `04_Assets/audio_voice/`, `04_Assets/archive/audio/`, and project root (including case-insensitive matching).
  * Line 1039-1041: `EP01_CANONICAL_SCENES = [f"ep01_scene{i:02d}" for i in range(1, 11)]`. Verified 10 scenes covering exactly 140 shots (1400s = 23m20s) in `episodes/ep01/prompts/muse_prompts.json`.
  * Line 1044-1090: `resolve_scene_master(scene_id)` implements candidate prioritization with 4-tier type score:
    - Tier 4: `06_Exports/{scene_id}_master_audio_v*.mp4`
    - Tier 3: `06_Exports/{scene_id}_cinematic_master_v*.mp4`
    - Tier 2: `06_Exports/{scene_id}_master_v*.mp4`
    - Tier 1: `04_Assets/videos/{scene_id}*master*.mp4`
    Sorted by `(type_score, v_num, p.stat().st_mtime)` with `reverse=True`.
  * Line 1292-1426: `assemble_episode_master` executes multi-scene assembly targeting `EP01_CANONICAL_SCENES`, resolves output path to `06_Exports/ep01_full_feature_master_v1.mp4`, performs FFmpeg `filter_complex concat` (`[v][a]`), and applies Two-Pass Linear EBU R128 Loudness Normalization (-14.0 LUFS, TP -1.0 dBTP, LRA 9.0).
  * Line 1448-1476: CLI arguments `--assemble-episode`, `--scenes`, `--check`, `--dry-run` wired and functional.
- **`05_Production_Pipeline/assemble_ep01_feature.py`**:
  * Line 63-116: `resolve_scene_part(scene_id)` prioritizes `_master_audio` (type_score 4) > `_cinematic_master` (type_score 3) > `_master` (type_score 2) > videos dir (type_score 1). Default fallback: `06_Exports/{scene_id}_master_audio_v1.mp4`.
  * Line 118-138, 280: `--scenes 10` campaign support is the default, resolving `EP01_SCENE_IDS[:10]` and outputting `06_Exports/ep01_full_feature_master_v1.mp4`.

### 1.2 Automated Test Execution Results
- `pytest tests/test_production_pipeline_m4.py -v`: 15 passed in 10.04s.
- `pytest tests/test_critic_gate.py -v`: 30 passed in 12.47s.
- `pytest tests/test_adversarial_m3_audio_engine.py -v`: 6 passed in 28.96s.
- `pytest tests/test_production_pipeline_m3.py -v`: 16 passed in 5.62s.
- `pytest tests/test_tier5_pipeline_hardening.py -v`: 20 passed in 4.81s.
- `pytest tests/test_m2_hygiene.py -v`: **5 passed, 1 failed in 0.36s**.
  Verbatim error:
  ```
  FAILED tests/test_m2_hygiene.py::test_character_portraits_unharmed
  AssertionError: Total character assets altered! Expected 62, found 96 (later 108)
  assert 96 == 62
  ```

### 1.3 System Invariants Observation
- **`04_Assets/archive/ep01_legacy_v1/`**: Exactly 184 `.mp4` video files (2.14 GB). `README.md` exists and contains citations of Vietnamese IP Law (Articles 4, 14, 20, 43), Author Nguyễn Sĩ Sơn (CCCD 031090010018), and Human-in-the-Loop creative evidence. **100% INTACT (PASS)**.
- **`04_Assets/characters/`**:
  * All 14 core character portraits specified in `CORE_EP01_CHARACTERS` exist, are valid PNG format, size > 500kB, and have exact expected dimensions. **100% INTACT (PASS)**.
  * `git ls-files 04_Assets/characters/`: Exactly 62 original tracked assets, all clean with zero unstaged modifications. **100% INTACT (PASS)**.
  * Physical filesystem check: Contains 108 files (62 tracked + 46 untracked turnaround sheet files named `*_turnaround_sheet_720p.png` and `*_turnaround_sheet_master.png` created continuously between 14:57 and 15:23).
  * This discrepancy causes `tests/test_m2_hygiene.py:149` (`assert total_char_files == 62`) to fail.

---

## 2. Logic Chain

1. **Verification of M4 Pipeline Requirements**:
   - The dispatch requested verification of:
     a) `assemble_episode_master`: verified canonical 10 scenes (`ep01_scene01` to `ep01_scene10` = 140 shots = 23m20s), output `06_Exports/ep01_full_feature_master_v1.mp4`, and CLI flags (`--assemble-episode`, `--scenes`, `--check`, `--dry-run`). All passed independently via programmatic simulation and CLI execution.
     b) Candidate prioritization: verified `_master_audio_v*` (score 4) > `_cinematic_master_v*` (score 3) > `_master_v*` (score 2) > videos (score 1), with highest version number `_v<N>` winning.
     c) `assemble_ep01_feature.py`: verified candidate scanning and default `--scenes 10` behavior.
   - Result: M4 Core Pipeline implementation is 100% verified, robust, and free of defects.

2. **Verification of System Invariants**:
   - The dispatch explicitly mandated:
     `Run python -m pytest tests/test_m2_hygiene.py -v (6/6 PASS).`
     `Verify 04_Assets/characters/ (62 files, 14 core portraits) remain 100% intact.`
     `Verify 04_Assets/archive/ep01_legacy_v1/ remains 100% intact.`
     `Run python -m pytest tests/test_critic_gate.py -v (30/30 PASS).`
   - When executing `pytest tests/test_m2_hygiene.py -v`, the test suite fails on `test_character_portraits_unharmed` because `total_char_files` is 108 instead of the expected 62.
   - Tracing the root cause revealed that 46 untracked turnaround sheet files were created in `04_Assets/characters/` between 14:57 and 15:23.
   - While none of the original 62 tracked files were modified or deleted, and all 14 core portraits are fully intact, the assertion `assert total_char_files == 62` fails.

3. **Adversarial Integrity & Review Decision**:
   - An adversarial reviewer must not certify unverified claims or overlook test suite failures.
   - Certifying `6/6 PASS` when the test runner produces `5/6 PASS, 1 FAIL` would constitute self-certifying / false attestation.
   - Therefore, the verdict must be `REQUEST_CHANGES` to alert the orchestrator to this invariant regression and allow clean remediation.

---

## 3. Findings

### [Major] Finding 1: Invariant Gate Regression in `tests/test_m2_hygiene.py`
- **What**: `tests/test_m2_hygiene.py::test_character_portraits_unharmed` failed with `AssertionError: Total character assets altered! Expected 62, found 96` (and later 108).
- **Where**: `04_Assets/characters/` and `tests/test_m2_hygiene.py:149`.
- **Why**: Concurrent or external processes added 46 untracked character turnaround sheet files (`*_turnaround_sheet_720p.png` and `*_turnaround_sheet_master.png`) into subdirectories of `04_Assets/characters/` between 14:57 and 15:23. This violated the strict total file count assertion (`assert total_char_files == 62`).
- **Impact**: Breaks gate verification invariant requirement `pytest tests/test_m2_hygiene.py -v (6/6 PASS)`.
- **Remediation Options**:
  1. *Option A (Isolate new files)*: Move the untracked turnaround sheet files to a separate directory (e.g., `04_Assets/characters_turnaround/` or `04_Assets/archive/turnaround_sheets/`) to restore the 62-file invariant in `04_Assets/characters/`.
  2. *Option B (Update invariant test)*: If turnaround sheets are intended permanent additions to the character asset inventory, update `tests/test_m2_hygiene.py` line 149 and documentation to recognize the new canonical file count.

---

## 4. Verified Claims

| Claim | Method | Result |
| :--- | :--- | :--- |
| Canonical 10 Scenes of Ep01 (140 shots = 23m20s) | Verified `EP01_CANONICAL_SCENES` and counted shots in `episodes/ep01/prompts/muse_prompts.json` | **PASS** (10 scenes, exactly 140 shots) |
| Candidate prioritization (`_master_audio` > `_cinematic_master` > `_master`) | Tested `resolve_scene_master` in `verify_m4_review.py` with 5 priority tiers | **PASS** (Score 4 > 3 > 2 > 1, higher version wins) |
| Default output path `06_Exports/ep01_full_feature_master_v1.mp4` | Programmatic dry-run and CLI test | **PASS** |
| CLI arguments `--assemble-episode`, `--scenes`, `--check`, `--dry-run` | Executed via CLI with subprocess | **PASS** (Clean 0 exit, accurate diagnostics) |
| `assemble_ep01_feature.py` support for 10 scenes & `_master_audio` | Verified `resolve_scene_part` and `get_ep01_assembly_parts(num_scenes=10)` | **PASS** |
| Legacy archive `04_Assets/archive/ep01_legacy_v1/` intact | Counted 184 files, verified `README.md` legal contents | **PASS** (184 files, 2.14 GB intact) |
| 14 core character portraits intact | Validated existence, PNG format, >500kB, and exact dimensions for all 14 portraits | **PASS** |
| Quality gate `tests/test_critic_gate.py` (30/30) | Ran `pytest tests/test_critic_gate.py -v` | **PASS** (30/30 in 12.47s) |
| M4 pipeline test suite `tests/test_production_pipeline_m4.py` | Ran `pytest tests/test_production_pipeline_m4.py -v` | **PASS** (15/15 in 10.04s) |
| Adversarial audio engine suite `tests/test_adversarial_m3_audio_engine.py` | Ran `pytest tests/test_adversarial_m3_audio_engine.py -v` | **PASS** (6/6 in 28.96s) |
| M3 pipeline test suite `tests/test_production_pipeline_m3.py` | Ran `pytest tests/test_production_pipeline_m3.py -v` | **PASS** (16/16 in 5.62s) |
| Pipeline hardening suite `tests/test_tier5_pipeline_hardening.py` | Ran `pytest tests/test_tier5_pipeline_hardening.py -v` | **PASS** (20/20 in 4.81s) |
| Hygiene invariant `tests/test_m2_hygiene.py` (6/6) | Ran `pytest tests/test_m2_hygiene.py -v` | **FAIL** (5/6 PASS, 1 FAIL on file count 108 != 62) |

---

## 5. Coverage Gaps & Caveats

- **Coverage Gaps**: None. All code paths in `assemble_episode_master`, `resolve_scene_master`, `resolve_audio_asset`, and `assemble_ep01_feature.py` were exercised.
- **Caveats**:
  * Real GPU rendering of the 140 shots via Muse.ai was not executed during this test run (tests use lightweight synthetic lavfi clips to verify FFmpeg filter_complex syntax, audio continuity, and loudnorm).
  * The untracked turnaround sheet files were not created by `worker_m4_assembly_1` (they appeared during concurrent background execution). Under Reviewer constraints ("Review-only — do NOT modify implementation code"), Reviewer 2 did not delete or alter these files.

---

## 6. Conclusion

- **Milestone M4 Engineering**: **APPROVED**. The assembly engine, candidate prioritization, EBU R128 mastering, and CLI interfaces are fully verified, robust, and adhere 100% to project directives (`AGENTS.md`, `GEMINI.md`, `PROJECT.md`).
- **Milestone M4 Gate Verdict**: **REQUEST_CHANGES** solely to address the invariant regression in `tests/test_m2_hygiene.py` resulting from the concurrent untracked turnaround files in `04_Assets/characters/`.

---

## 7. Verification Method

To independently verify this review report:

```bash
# 1. Run Reviewer 2 independent verification script
python .agents/teamwork/reviewer_m4_2/verify_m4_review.py

# 2. Run M4 Test Suite (15/15 PASS)
python -m pytest tests/test_production_pipeline_m4.py -v

# 3. Run Critic Gate Test Suite (30/30 PASS)
python -m pytest tests/test_critic_gate.py -v

# 4. Run Hygiene Invariant Suite (Reveals 1 FAIL on file count)
python -m pytest tests/test_m2_hygiene.py -v

# 5. Check character file count
python -c "import os; print(sum(len(f) for _, _, f in os.walk('04_Assets/characters')))"
```