Remove PRUNE_LIVE -- never wired to anything, and separately broken

PRUNE_LIVE=<K> was meant to actually prune moves below a predicted-FH
threshold for branching-factor measurement, but PruneLivePredict (the
macro alias for search.c's PruneVerifyPredict) was never called from
anywhere -- confirmed by grep: its only two references in the file
are its own #define and declaration. The wiring to make PRUNE_LIVE=<K>
actually prune a move was never written, so this flag has done
nothing even in builds where it compiled.

It also didn't compile on its own: PruneVerifyPredict returns
g_uJointFHThousandths[...]'s element as ULONG, but that array is
declared USHORT in data.c (confirmed pre-existing in the prior
PRUNE_VERIFY-removal commit, unrelated to that change).

Removed the entire #ifdef PRUNE_LIVE block in search.c (verified every
symbol inside it -- ShipDepthBucketPublic, JOINT_TABLE_SENTINEL_PUBLIC,
ShipLateBucketPublic, PruneVerifyPredict, PRUNE_LIVE_SENTINEL,
PruneLivePredict -- has no consumer anywhere outside that block) and
GNUmakefile's flag wiring, leaving an explanatory comment.

Verified: standard profile builds clean, precommit_check.sh passes.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

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