feat(coreaudio): synchronized duplex impl on macOS - #1298
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Adapted from f0bb87d (written against the pre-review duplex interface d5bfdc8) onto upstream develop's final interface (6593cf6 + 5c13c0d): - build_duplex_stream_raw now takes separate input/output sample formats; each direction's ASBD and buffer sizing uses its own format. - Timestamps use the unified CallbackInfo/StreamTimestamp types and report xruns via the processor-overload listener (one flag reported on both directions, since the overload notification is undirected). - The duplex render callback pre-fills output with equilibrium and honors the draining flag; stop() drains over one buffer's duration. - DisconnectManager gains an opt-in buffer-size-change listener on top of upstream's overload listener; duplex streams enable it because the input scratch buffer is sized to the negotiated frame count. - Streams are no longer auto-started at build; call start(), matching the input/output builders.
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I'm still drafting this. First round testing now since the merge of #1229 .