docs: spec the audio panel doctor

Answers the four questions the request asked, from a live survey rather than
from memory. There is no PulseAudio: the stack is pipewire, wireplumber, and
pipewire-pulse, all user-scope, so no remedy in this feature needs sudo — which
is why it mirrors the net panel's doctor rather than the maintenance console's
privileged verb table.

Two findings shape the design. pactl hangs against a server that accepts and
never answers, which is exactly the fault a doctor exists to diagnose, so every
probe is bounded. And the panel cannot diagnose itself, because pactl is the
layer most likely to be down — the probes read systemctl and pw-dump before
they touch it.

Filed the panel's own missing timeout as a separate bug. It freezes the audio
panel today, independently of any doctor.

Seven decisions left open; the spec is DRAFT and nothing gets built until they
close.

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