Telemetry proof: overrideOutputAudioPort(.none) routes to Receiver once, then every
later toggle latches to built-in Speaker despite opts=36 (no .defaultToSpeaker) —
WebKit's WebRTC engine re-forces the loudspeaker after our override. The prior build
ignored .override-reason route changes and never corrected it.
Now: react to ALL route changes, debounced 0.25s, and re-assert the chosen port only
on a genuine mismatch (self-terminating, capped at 6/toggle to avoid thrash). setSpeaker
returns a reason->port route-change trail so the log shows whether WebKit is one-shot
or persistent. native marker 1.0.3-reassert.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>