Two changes:
1. wave: 3 → 6 (cascade: max(wave(05)=4, wave(06)=5)+1 = 6).
2. Task 1 <automated> verify now prefixes the ffprobe invocation with
test -f tests/fixtures/last_30sec.webm && which ffprobe so the gate
fails fast with a clear signal if the human checkpoint never produced
the fixture (instead of ffprobe blowing up with a cryptic file-not-found).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
