# Progress Log - challenger_m4_2

Last visited: 2026-10-09T08:19:30Z

## Status
- [x] Initialized DISPATCH.md and updated BRIEFING.md
- [x] Read required documents (ORIGINAL_REQUEST.md, PROJECT.md, worker_m4_assembly_1/handoff.md, DISPATCH.md)
- [x] Challenge 1: Empirically probe EBU R128 Audio Loudness Normalization (-35 LUFS, -6 LUFS, silence) and measure via ffprobe/ebur128:
  - Quiet input (-53.77 LUFS) -> Normalized: -13.95 LUFS (raw ebur128: -14.0 LUFS), True Peak: -9.33 dBTP (<= -1.0 dBTP) [PASS]
  - Loud input (-24.75 LUFS) -> Normalized: -14.03 LUFS (raw ebur128: -14.0 LUFS), True Peak: -10.05 dBTP (<= -1.0 dBTP) [PASS]
  - Hot input (-1.15 LUFS, -0.04 dBTP peak) -> Normalized: -14.01 LUFS, True Peak: -12.92 dBTP (<= -1.0 dBTP) [PASS]
  - Silent input (-inf LUFS) -> Silence guard active, safe anull fallback, zero crash, audio track intact [PASS]
- [x] Challenge 2: Empirically probe 10-Scene Episode Assembly:
  - Candidate priority ranking verified: `_master_audio_v*` > `_cinematic_master_v*` > `_master_v*` > `VIDEOS_DIR _master` [PASS]
  - Version ordering verified: `v2` > `v1` [PASS]
  - Missing scene abort verified: halts assembly and returns None [PASS]
  - Check mode (`--check`) verified: reports readiness and status cleanly [PASS]
  - Dry-run mode (`--dry-run`) verified: displays FFmpeg command without writing file [PASS]
  - 10 synthetic scenes assembly verified: generates `06_Exports/ep01_full_feature_master_v1.mp4` with full duration (5.0s) and both H264 video and AAC stereo audio [PASS]
  - Anti-overwrite auto-versioning verified: auto-increments to `v2` when `v1` exists [PASS]
  - CLI commands for `production_orchestrator.py` and `assemble_ep01_feature.py` verified [PASS]
- [x] Challenge 3: Run pytest test suites:
  - `python -m pytest tests/test_production_pipeline_m4.py -v`: 15/15 passed in 10.26s [PASS]
  - `python -m pytest tests/test_production_pipeline_m3.py -v`: 16/16 passed in 6.20s [PASS]
  - `python -m pytest tests/test_adversarial_m3_audio_engine.py -q`: 6/6 passed [PASS]
  - Aggregate 37/37 passed in 43.88s [PASS]
- [x] Complete handoff.md with APPROVE verdict following 5-component protocol
- [ ] Send completion message to parent orchestrator