Goal: test strict logged-out playback for my own upload qq15at0yfYM.

Environment:
- Google Chrome Incognito
- Fresh temp profile via --user-data-dir
- Logged out

Observed sequence:
1) Page displayed YouTube player UI with the timestamp at 0:45 / 3:08 (suggesting it loaded at the requested t=45s).
2) After ~15s, the player transitioned to a "Video unavailable" state.

This is NOT a strict logged-out PASS (no evidence of time advancing across two screenshots).