docs: record the second review pass on the input-side spec

I ran a second pass across four critical lenses: buildability, technical correctness, adversarial failure-modes, and internal consistency. The technical foundations held. I verified every load-bearing code and /proc/asound claim against the real tree.

I recorded eight findings, two of them blocking. The mic-unmute remedy fails open on an unreadable graph, and a privacy event must fail closed. A Bluetooth or USB-non-ALSA mic classifies as no-mic-hardware because it never appears under /proc/asound. I also fixed three mechanical inconsistencies in place: a remedy miscount, and two stray OUTPUT/INPUT doctor-key labels the SPEAKERS/MICROPHONE rename missed.

The spec stays DRAFT. The blocking findings gate it from READY.

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