docs: fold the failure taxonomy into the input-side spec

I grounded the spec in the taxonomy and its triage. A new "Verdict clusters and remedy classes" section maps the doctor's verdicts onto the nine saturation-tested symptom clusters, ties the four remedy classes to the run-time privilege decision, and names the three new probes the taxonomy implies: dmesg hints, the unmute-doesn't-stick signature, and re-probe-after-idle.

v1 stays the buildable core, phases 0 through 4. The rest of the taxonomy is staged as later phases so v1 isn't blocked on it.

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