Reverse: a served-shorter episode is furniture, not advertising

Measured against the owner's 334 mirrored episodes, the symmetric
durationSlopMs rule from the previous round costs far more than it
protects: 31% of episodes are served shorter than their declared
length (feeds are sloppy by tens of seconds -- one show ran -47s,
-33s, +88s, -95s across episodes), and every break in every one of
them fell to the unjudgeable default and got labelled "Ad break" --
including closing credits at 37:41 of a 38:25 episode. The owner's
furniture toggle did nothing on nearly a third of his library.

You cannot insert advertising into a file and have it come out
shorter, so a negative gap is evidence that nothing was inserted,
not evidence the feed can't be trusted. Classify's insertion test is
one-sided again: inserted := servedMs<=0 || declaredMs<=0 ||
(servedMs-declaredMs) > adUnitMs. durationSlopMs (2000) is replaced
by adUnitMs (15000) -- advertising is sold in ~15s units, so an
overrun under one unit is the feed being approximate, not an
insertion. Both unjudgeable cases (servedMs<=0, declaredMs<=0) are
unchanged; furnitureKindAt's position logic is unchanged.

This reverses the FIX-1 decision in this same file that made the
test symmetric, on the theory that a feed wrong in the short
direction couldn't be trusted to judge the other direction either.
Rewrote the two pre-existing tests that encoded that decision
(TestAnEpisodeShorterThanDeclaredIsAlsoAllFurniture, folded as a
duplicate, and the renamed
TestAServedLengthShorterThanDeclaredByFarIsStillFurnitureByPosition)
plus one comment on an unchanged assertion, and added coverage for
the new threshold's band (a 10s overrun is now furniture, not ad).

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

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