# BRIEFING — 2026-10-09T06:27:00Z

## Mission
Adversarially and empirically verify Milestone M3 Gate: Audio Guard enforcement, MUSE_DRY_RUN pipeline execution, Head-Tail chaining, tail frame 239 extraction, Scene Gate pre-flight behavior, and pipeline test suites.

## 🔒 My Identity
- Archetype: empirical_challenger
- Roles: critic, specialist
- Working directory: c:\Projects\KieuStory\.agents\teamwork\challenger_m3_2
- Original parent: 97faf5e5-a830-491c-b78c-2af12175badf
- Milestone: M3
- Instance: 2 of 2

## 🔒 Key Constraints
- Review-only — do NOT modify implementation code
- Review and challenge empirically by executing tests, generators, stress harnesses
- Output verdict (APPROVE / REQUEST_CHANGES) in handoff.md
- Message parent orchestrator upon completion

## Current Parent
- Conversation ID: 97faf5e5-a830-491c-b78c-2af12175badf
- Updated: 2026-10-09T06:27:00Z

## Review Scope
- **Files to review**:
  - `episodes/ep01/prompts/muse_prompts.json`
  - `05_Production_Pipeline/production_orchestrator.py`
  - `05_Production_Pipeline/run_shot.py`
  - `05_Production_Pipeline/antigravity_critic_gate.py`
  - `tests/test_production_pipeline_m3.py`
  - `tests/test_m2_hygiene.py`
  - `tests/test_m3_challenger1_probe.py`
- **Interface contracts**:
  - `.agents/teamwork/ORIGINAL_REQUEST.md`
  - `.agents/teamwork/orchestrator_1/PROJECT.md`
  - `.agents/teamwork/worker_m3_pipeline_1/handoff.md`

## Attack Surface
- **Hypotheses tested**:
  1. Audio Guard compliance: Tested all 192 prompts in `episodes/ep01/prompts/muse_prompts.json` and orchestrator rejection behavior.
  2. MUSE_DRY_RUN pipeline: Tested headless simulation of batch render with `enable_critic=True` and `enable_critic=False`.
  3. Head-Tail chaining & tail frame 239: Tested propagation to subsequent shot start frame.
  4. Scene Gate pre-flight: Tested missing file, critical axis rejection, and unapproved score handling.
  5. AntigravitySDKEngine: Tested live SDK execution in critic gate.
  6. Character safeguards: Tested all 140 shots across Scenes 01 to 10 for cross-contamination.
- **Vulnerabilities found**:
  1. 4 of 192 prompts in Ep01 (`prologue_shot_1..4`) lack canonical Audio Guard text.
  2. `production_orchestrator.py` does NOT reject prompts without Audio Guard; it silently auto-appends, leaving `validate_audio_guard` dead code.
  3. `MUSE_DRY_RUN` batch render fails under default `enable_critic=True` because synthetic video is flat solid navy blue and triggers `Frozen video detected`.
  4. `AntigravitySDKEngine.evaluate_shot` contains unawaited coroutine `agent.chat` causing `RuntimeWarning` and 100% fallback.
  5. `concat_scene_shots` allows unapproved scenes (`score < 0.8` with `suggested_action == "APPLY_COLOR_MATCH"` or `"TRIM_STATIC"`) to bypass rejection and be stitched.
  6. `ep01_scene03_shot05` (Thúy Vân) has `character_asset_ref` pointing to Thúy Kiều and resolves to Thúy Kiều portrait, failing `test_m3_challenger1_probe.py`.
- **Untested angles**:
  - Live Meta Muse cloud browser sessions (requires credentials/GUI).

## Loaded Skills
- None.

## Key Decisions Made
- Empirical Verdict: REQUEST_CHANGES based on 5 confirmed reproducible failure modes.

## Artifact Index
- `DISPATCH.md` — Inbound instructions from orchestrator
- `BRIEFING.md` — Situational awareness
- `progress.md` — Execution tracking and heartbeat
- `handoff.md` — 5-component empirical challenge report and verdict