Preserve system microphone volume on startup - #262
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CoreVideo's Windows engine called SetMicVol(0) during authentication, lowering the operator's real microphone level when Zoom selected the default device. Replace fake-device selection and volume writes with a never-fed SDK virtual microphone. Disable both automatic microphone-volume controls and block Join if virtual-source registration fails.
Windows build and all 75 CTest regressions pass. New coverage checks failed registration, reinitialization, no transmitted PCM, and no receive-subscription changes. Includes v0.1.48 notes; live Zoom startup and talkback validation remains pending.