The .8 widget broke unmuting in production (both with the AI filter on and off); threadnet-call dcc8643 restores the upstream off-path and hard-gates the feature until the webAudioMix decision. Verified locally end to end: the installed package carries the model assets, webpack lands them under webapp/widgets/element-call/assets/dfn3, and the widget index.html references the .9 bundle (0.19.2-threadnet.9+dcc86431). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>