docs: fold the saturation-test findings into the audio taxonomy

A blind resample tested whether the nine-cluster taxonomy was representative or an artifact of the first sweep. Ten agents drew 108 fresh reports through five different doors per direction, mostly non-Arch and 2024-2026, none shown the clusters. Zero forced a new cluster. About 70 re-found existing entries. The other 34 were new distinct root causes that all fit existing clusters.

I folded the 34 new entries in, 16 input and 18 output, each tagged with its cluster and remedy class, and recorded the test and its verdict. The clusters are complete and stable. Entries keep growing under them without changing the design.

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