YouTube public probe (logged-out / private window equivalent):
- video_id: 2t04G0Yw2Lw
- generated_at: 2026-09-15T17:30:57Z
See probe.json + probe_excerpts.json for HTTP GET status/markers + snippets.
Note: YouTube Shorts playback is often gated or unavailable when logged out; MP4 fallback is published on the hub.