Design: separate a show's own audio from the inserted advertising

Three defects turn out to be one missing distinction. Ad detection finds
a median 67% of the advertising the length gap implies, because it can
only see what two simultaneously-mirrored episodes share. It reports a
show's own intro, break cue and credits as advertisements on 111 of the
138 episodes that had nothing inserted into them. And intro/outro
offsets stay withheld for want of independent evidence.

Peter's observation about theme music around ad breaks is the clue, and
probing it showed both what it gives and what it does not: the cue is
real, already detected, and marks a break's entry but not its extent --
scanning to r=0.6 finds one isolated hit per slot in ad-laden and ad-free
copies alike, so there is no closing cue to bracket against.

Writing this up changed the recommendation. The furniture library is only
needed for the intro/outro problem; the mislabelling falls out exactly
and for free from served length versus declared, and cues are
identifiable from their signature within a single batch. So the proposal
is now the cheap approach first, with the library kept for later and only
if the withheld offsets are wanted.

Nothing here is built. Review document, not an implementation.

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

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