Ships threadnet-call df4e5ee: the AI filter attaches to the microphone track after publication with its own AudioContext on just that track. The feature gate stays closed, so this behaves identically to v0.5.1 for every user; a single test client opts in via two localStorage keys. The gate opens only after the filter passes a two-person call - standing rule from #0054. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>