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* feat(audio): renderer-bus in streamer mix + whole-app loopback plumbing Two tester-confirmed gaps under ASIO/exclusive output: 1. Streamer mix carried guitar only when the song rode the renderer bus: composeAndPushStreamMix mixed guitar + native backing, never the bus. The bus ring is single-consumer, so the consumer step is reworked from mixRendererBusInto (drain+add) to pullRendererBus (drain once into a fixed scratch); both output callbacks then share the pulled block between the device output and the stream submix (rides includeBacking — it IS song audio). 2. Previews/UI sounds bypass the per-surface feeder taps entirely and leak to the default WASAPI device (audible under ASIO, which doesn't silence that endpoint). New plumbing lets the static bundle capture ALL app audio: setDisplayMediaRequestHandler answers with this window's own frame as audio source (frame-scoped — no other apps' audio), plus audio:setPageMuted IPC + preload setPageMuted() as the local-silence fallback when suppressLocalAudioPlayback is unsupported. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * feat(diag): engine health metrics on every [asio-diag] line Tester symptom: all audio dead after stopping a song with tones active. The snapshot showed routing state but not whether the engine was still producing. Append volatile fields (outside change-detection): in/out/ backing levels, bus fill, input overflows, output underflows, split-ring fill — outputLevel≈0 with running=true is the silent-engine signature. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * fix(main): clear Chromium HTTP cache before first load Testers hop between portable builds sharing one userData dir; an older build's server sent no Cache-Control, so its cached /static/app.js outlived it and silently replaced the new build's renderer code (the fix14 'watcher never installed' log). One cheap clearCache() per launch makes stale-bundle states impossible even against old-server caches. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> --------- Co-authored-by: Claude Fable 5 <noreply@anthropic.com>