Fix the early-fall soft-lock: the decided latch must die with its rally

Oliver's retest: 'the fall never happens, the game does not continue, the
ball is gone.' Root cause: the decided latch was set AFTER resolveInterlude,
and on a point with no stage change matchPoint re-arms the next rally
synchronously — so the latch outlived the rally it scoped and swallowed
every resolution after it.

Two changes: matchFallWillPlay() gates the early resolution to points that
actually put a collapse (or the game-winning kill) on court — an ordinary
point keeps its ordinary bounce-2 ending, so the ball never vanishes
mid-roll — and with only those paths admitted, the after-set latch is
provably safe: both defer matchReady until their beat ends. A regression
test drives the exact soft-lock sequence through the real update loop.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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