Record that lowering the noise floor to 8s is wrong

The 12s floor cut real detection on shows with verified ads -- LeVar
Burton Reads fell from 19.0 to 10.5 minutes found against a 26.6 minute
gap -- so 8s looked like the fix. Measured on an isolated copy of the
live data it is not: Sleepy History at 8s finds 174 minutes of
"advertising" in a show that has 48 seconds of it, worse than the 4s
floor that produced Peter's original complaint.

MinRunSamples and MergeGapMs interact and cannot be tuned separately. A
low floor lets noise fragments survive and the 60s bridging then welds
them into enormous spans.

Had only LeVar been measured the floor would have been lowered.

Also re-pins .coverage-baseline, which the hook left modified after
d96c876 deleted covered readout code.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018AwnALZL6bD4VBtATDVv3B

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