Two bugs in one small feature, both mine.

The 'worth a second listen' table was appended by a str.replace whose anchor did not
match, and I had not asserted on that one — so the code was present, the function
computed 39 rows, and the report silently shipped without them. Every other patch in this
file asserts its anchor; this is why.

And the comparison was at the wrong level. A `hits` kit IS percussion, so CLAP hearing
'a kick drum' in one is agreement, not contradiction — comparing family names instead of
their underlying stems reported every kick and snare in the pack as suspicious. Same for
fx/tonal/vox, which all map to `other` and genuinely cannot contradict each other.

Also adds --report-only, which rebuilds the report and cheatsheet from the manifest. The
manifest is the record and those are views of it, so anything that legitimately changes
the audio after a cut (restage staging a kit and re-grading it) leaves them describing
numbers that are no longer true — and re-cutting a whole pack to refresh a markdown table
would be absurd.