Decide where a break is line by line, not by how far the master drifted

Three episodes were missing a whole advertisement, which was the largest error
left in subtraction. Diagnosed rather than guessed at: Incels "From Victim to
Violence" has a three-minute pre-roll in which the served copy runs 463 words
against the master's 84, and it was refused because the master advanced more
than the ten words of drift the rule allowed.

That guard was there for a real reason -- a stretch where both texts advanced is
one where you cannot say which part of it is the advertisement -- but it answered
the question at the wrong resolution. The gap as a whole need not be all
advertising; its individual lines are each either in the master or not, and that
is answerable. So the drift guard is gone and every gap is partitioned line by
line against the master instead, which is the same machinery the edge trim
already used. The trim is no longer a separate step a caller has to remember,
which is just as well: a caller who forgot it would publish a skip over the last
sentence of the programme.

Measured across all eighteen episodes holding a master:

    before   73% - 110%, mean 99%, three episodes missing a pod
    after    99% - 110%, mean 103%, every episode finding every pod

    #67 Jenna                 81% -> 106%   3 pods -> 4
    Behind the Scenes         73% -> 101%   3 pods -> 4
    From Victim to Violence   78% ->  99%   3 pods -> 4

Nothing got worse. The fifteen episodes that were already right are unchanged to
the percentage point.

The fixtures spoke at 360 words a minute, which hid the fact that the word floor
and the duration floor disagree about what counts as an advertisement. They now
run at about 180, which is roughly how fast people talk, and the two floors
agree.

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

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