docs: close the audio-doctor spec and its task

The doctor shipped end to end, so the spec goes to IMPLEMENTED and the task closes with a dated record of what landed.

Three things the Decisions did not anticipate are written into the history rather than left for a reader to infer. A tenth verdict for missing tooling, because an absent pactl is an unobserved stack and not a broken one. A re-probed marker between a fix run's two row blocks. And DIAGNOSE as the read-only key's name, which Craig settled after asking why this panel carries two keys where the net panel carries one.

I filed the wall-controls convergence as its own task. Craig wants the net panel's copy and close pair on every output wall, and today no two of the four agree.

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