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Real testing (Safari + Firefox, fresh rejoins) confirmed VP9 selection always falls back to VP8 - our fork's buildPublishOptions() forces simulcast:true unconditionally, which breaks LiveKit's SVC negotiation path that vp9/av1 require. This is the same failure mode originally suspected in the 2026-07-28 incident; the "LiveKit handles this automatically" assumption from doc research did not hold up in practice. Reverting to the known-safe VP8/H.264/H.265 SFU allow-list and widget image. Root cause documented in Issue #11 for a future, scoped fix (conditional simulcast vs. scalabilityMode per codec).