Calls connect but no participant can unmute, and the SFU log shows not a single published track. v0.5.0 is the first production image carrying the AI noise suppression code in the audio capture path, and v0.4.3 is the last image calls demonstrably worked on. Restoring service first; the cause is still open. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>