Slice a recorded session's lossless video into individual frame PNGs
(ffmpeg -vsync 0, no drop/dup) via a new `extract-frames` subcommand,
with frame count cross-checked against the manifest and input log so
any capture-rate drift surfaces immediately instead of silently
misaligning frames and logged input later. Includes a real end-to-end
test against an ffmpeg-generated synthetic video (skipped when ffmpeg
isn't installed, e.g. bare WSL).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Jonas
2989a0814c