# BRIEFING — 2026-10-08T15:59:45Z

## Mission
Empirically stress-test and challenge the grand master assembly pipeline (`assemble_ep01_feature.py`), programmatic invocation, and character asset resolution aliases in `production_orchestrator.py`.

## 🔒 My Identity
- Archetype: empirical_challenger
- Roles: critic, specialist
- Working directory: c:\Projects\KieuStory\.agents\teamwork\challenger_m5_assembly_2
- Original parent: f9992164-c0e4-4f7d-ba4a-25a83a4436bf
- Milestone: Milestone 5 (Assembly CLI & Engine Stress Tester)
- Instance: 2 of 2

## 🔒 Key Constraints
- Review-only — do NOT modify implementation code directly; findings reported as observations and bugs
- Empirical verification mandatory: run code, write stress harnesses/test oracles, execute via shell
- Do NOT trust worker claims without empirical reproduction
- Provide explicit verdict: APPROVE or REQUEST_CHANGES in handoff.md

## Current Parent
- Conversation ID: f9992164-c0e4-4f7d-ba4a-25a83a4436bf
- Updated: 2026-10-08T08:55:26Z

## Review Scope
- **Files to review**:
  - `05_Production_Pipeline/assemble_ep01_feature.py`
  - `05_Production_Pipeline/production_orchestrator.py`
  - `04_Assets/characters/`
  - `06_Exports/`
- **Interface contracts**: PROJECT.md, ORIGINAL_REQUEST.md, AGENTS.md, GEMINI.md
- **Review criteria**:
  - `assemble_ep01_feature.py --check` exit code & output
  - `assemble_ep01_feature.py --dry-run` exit code & output
  - Programmatic import & invocation `from assemble_ep01_feature import assemble_grand_feature`
  - Asset resolution `resolve_start_frame()` with verbose aliases mapping to canonical character files
  - Robustness under edge cases (missing files, invalid args, dry-run variations)

## Attack Surface
- **Hypotheses tested**:
  - CLI `--check` exits with 0 and correctly identifies missing scene 15: Confirmed.
  - CLI `--dry-run` exits with 0 and produces mock pipeline: Confirmed.
  - Programmatic import of `assemble_grand_feature` has zero side effects and does not trigger `sys.exit(1)`: Confirmed.
  - Missing scenes return `False` safely without unhandled exceptions: Confirmed.
  - Verbose character aliases cleanly map to existing disk files in `04_Assets/characters/`: Confirmed (10/10 test cases, 0 unresolved across all 188 shots).
  - Version sorting handles integer ordering (`v10` > `v2`): Confirmed.
  - Full assembly across 17 parts via FFmpeg filter_complex produces valid master video and audio: Confirmed.
- **Vulnerabilities found**: None.
- **Untested angles**: Live rendering of Scene 15 shots via Meta Muse browser session (deferred to live generation phase).

## Loaded Skills
- None

## Key Decisions Made
- Confirmed full compliance with Milestone 5 requirements.
- Issued verdict: APPROVE.

## Artifact Index
- `.agents/teamwork/challenger_m5_assembly_2/BRIEFING.md` — Agent working memory
- `.agents/teamwork/challenger_m5_assembly_2/DISPATCH.md` — Initial dispatch message
- `.agents/teamwork/challenger_m5_assembly_2/progress.md` — Liveness & heartbeat
- `.agents/teamwork/challenger_m5_assembly_2/handoff.md` — Final 5-component handoff (Verdict: APPROVE)