Run compose api as HOST_UID/GID with cache under /tmp, poll slice files for
ready_event when ffmpeg stderr is silent, invoke batch via venv python, exclude
logs from build context, and document Docker cache/VLC troubleshooting.
Co-authored-by: Cursor <cursoragent@cursor.com>
Background ffmpeg pull on all site cameras reduces cold-start latency on start_surgery; timing logs record connect and ready phases. Enable via RTSP_PREWARM_ENABLED in the committed env.
Co-authored-by: Cursor <cursoragent@cursor.com>
