Bridge ad pods fragmented by brief lapses in agreement

A pod of several advertisements is found as several matches, because
agreement lapses between them. Published unbridged, 45% of the gaps
between consecutive breaks came in under ten seconds and 152 of 262
multi-break episodes contained one -- which plays as a skip, a one-to-
nine-second burst of advertisement, then another skip. Bridging also
moves agreement with the declared length gap from 69% to 73% median,
because what was bridged was advertising too.

MaxBreakMs now applies to the matches rather than to what bridging makes
of them. Applied after bridging it refused five episodes that bridging
had pushed over the four-minute cap, Radiolab's Grass Apes among them --
a 3:55 pre-roll and an 0:18 tag two seconds apart fuse to 4:15, and the
episode the whole chain was device-verified on would have published
nothing. One enormous match is evidence of shared programme; a chain of
ordinary matches a beat apart is evidence of an ad pod. MaxSkipFraction
still guards the episode as a whole.

Also pins the ad scan's production values, which were measured rather
than picked, and records what probing Peter's theme-music observation
turned up: the cue is real and already detected, it marks a break's entry
but not its extent, a second fetch is not an ad-free reference, and 138
of 322 mirrored episodes contain no inserted advertising at all while the
scan reports breaks on 111 of them.

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

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