# BRIEFING — 2026-10-09T07:39:00Z

## Mission
Empirically challenge the remediated classify_shot_take classifier, bilateral safeguards in resolve_start_frame_v2, and prompt anchor synchronization for Milestone M3 Iteration 3 Gate Verification.

## 🔒 My Identity
- Archetype: EMPIRICAL CHALLENGER
- Roles: critic, specialist
- Working directory: c:\Projects\KieuStory\.agents\teamwork\challenger_m3_iter3_1
- Original parent: 97faf5e5-a830-491c-b78c-2af12175badf
- Milestone: M3 Iteration 3 Gate Verification
- Instance: 1 of 1

## 🔒 Key Constraints
- Review-only — do NOT modify implementation code
- Run verification code yourself; do NOT trust worker's claims or logs
- If a bug cannot be reproduced empirically, it does not count
- Deliver handoff.md with 5 components (Observation, Logic Chain, Caveats, Conclusion, Verification Method) and explicit verdict (APPROVE or REQUEST_CHANGES)
- .agents/teamwork/ holds only metadata — never place source code or tests there

## Current Parent
- Conversation ID: 97faf5e5-a830-491c-b78c-2af12175badf
- Updated: 2026-10-09T07:32:09Z

## Review Scope
- **Files to review**:
  - `05_Production_Pipeline/production_orchestrator.py` (classify_shot_take, resolve_start_frame_v2)
  - `episodes/ep01/prompts/muse_prompts.json`
  - `02_AI_Prompts/gemini_banana_prompts.json`
  - `tests/test_m3_challenger1_probe.py`
  - `tests/test_adversarial_tail_frames_m3_probe.py`
  - Worker handoff: `.agents/teamwork/worker_m3_remediation_3/handoff.md`
- **Interface contracts**: `PROJECT.md`, `AGENTS.md`, `GEMINI.md`
- **Review criteria**: Zero actor-switch mismatches across all contiguous shot pairs, zero face leakage on simulated tail frames, regression suite 100% pass.

## Attack Surface
- **Hypotheses tested**:
  - Hypothesis 1: `classify_shot_take` correctly identifies actor transitions as CINEMATIC_CUT across all 140 contiguous shot pairs in Ep01. Result: CONFIRMED (0 mismatches).
  - Hypothesis 2: Physical tail frames on disk never cause face leakage across character boundaries in `resolve_start_frame_v2`. Result: CONFIRMED (Safeguard bypasses tail frame and resolves to authentic character portrait).
  - Hypothesis 3: Diverse adversarial character transitions (Vương Ông -> Vương Quan, Kim Trọng -> Thúy Kiều, Thúy Kiều -> Kim Trọng, Thúy Vân -> Thúy Kiều, Thúy Kiều -> Thúy Vân, Vương Quan -> Vương Ông) resolve strictly to authentic character portraits without tail frame leakage. Result: CONFIRMED (8/8 adversarial transition tests passed 100%).
- **Vulnerabilities found**: None. Remediation in Iteration 3 successfully eliminated the latent transition gap and face leakage risks.
- **Untested angles**: Full production video render on live remote browser (`agent-browser --session muse`) requires active session credentials. Tested thoroughly via dry_run and simulated tail frame injection.

## Loaded Skills
- None explicitly assigned.

## Key Decisions Made
- Executed `test_m3_challenger1_probe.py` directly: 12 passed.
- Authored and executed dedicated stress suite `tests/test_adversarial_tail_frames_m3_probe.py` with physical tail frames across 6 character boundaries: 8 passed.
- Executed full regression suite (`test_production_pipeline_m3.py`, `test_critic_gate.py`, `test_m2_hygiene.py`, `test_m1_challenger2_probe.py`, `test_adversarial_deep_probe.py`): 126 passed.
- Verdict: APPROVE Milestone M3 Iteration 3 Gate.

## Artifact Index
- `BRIEFING.md` — persistent working memory
- `progress.md` — liveness heartbeat
- `DISPATCH.md` — task dispatch instructions
- `handoff.md` — final empirical challenge verdict report
- `tests/test_adversarial_tail_frames_m3_probe.py` — adversarial stress harness for character transitions