refactor: enhance _encode_bt709_output and _encode_bt709_command for improved audio stream handling and code clarity

Merge branch 'main' into NLag/issue4

Avoid OpenCV H264 writer fallback errors

feat(report): add annotated issue clips

fix(renderer): preserve video colors in annotations

fix(renderer): prefer web-friendly video codecs

feat(renderer): generate annotated pose videos

first commit