Remove PRUNE_VERIFY entirely -- never compiled in its current form

PRUNE_VERIFY (shadow verification for ShouldLatePrune's deep-prune
gate) is dead code that has apparently never been built successfully:
search.c's #if defined(PERF_COUNTERS) && defined(PRUNE_VERIFY) block
reads fVerifyFlagged/uVerifyBand/uVerifyDepthB/uVerifyAttB/
uVerifyRateB/uVerifyPred, none of which are declared or assigned
anywhere in the file. Confirmed by compiling search.c with
-DPRUNE_VERIFY directly: 7 "use of undeclared identifier" errors.
Since GNUmakefile never defines PRUNE_VERIFY on any path (it's
opt-in only, ifdef PRUNE_VERIFY / PROFILE += -DPRUNE_VERIFY), nothing
has ever caught this.

Removed rather than fixed: reconstructing fVerifyFlagged/uVerifyBand/
etc.'s intended semantics from scratch would be inventing behavior,
not restoring it -- there's no prior working version to recover.

Removed: the broken block in search.c's move loop; its two
PRUNE_VERIFY-exclusive helper functions (PruneVerifyBand,
PvAttBucket/PvRateBucket -- careful to keep ShipDepthBucketPublic/
JOINT_TABLE_SENTINEL_PUBLIC/ShipLateBucketPublic/PruneVerifyPredict,
which PRUNE_LIVE also uses via its PruneLivePredict alias, simplifying
that block's guard from "(PERF_COUNTERS && PRUNE_VERIFY) || PRUNE_LIVE"
to just "PRUNE_LIVE"); the COUNTERS and g_Options struct fields in
chess.h (u64PruneVerifyTries/FailHigh/MarginSum/PredSum/Dyn/DynMiss)
and PRUNE_VERIFY_BANDS/SHIP_DEPTH_BUCKETS (the latter was only ever
used by PRUNE_VERIFY code); root.c's dead counter copies; script.c's
report-printing block and SHIP_DEPTH_BUCKETS-sized suite-total fields;
GNUmakefile's flag wiring (left a comment explaining the removal).

Found while scoping the PRUNE_LIVE guard above: PRUNE_LIVE is ALSO
currently broken (separate, pre-existing, unrelated bug) --
PruneVerifyPredict (search.c) returns g_uJointFHThousandths[...]'s
element type as ULONG, but that array is declared USHORT in data.c,
producing an "incompatible pointer to integer conversion" error under
-DPRUNE_LIVE=<K>. Confirmed pre-existing (reproduces identically with
this commit reverted). Not fixed here -- out of scope, nobody's asked
to touch PRUNE_LIVE, flagging for awareness only.

Verified: standard profile (GENETIC=1 PERF_COUNTERS=1 MP=1 SIXTYFOUR=1)
builds clean, precommit_check.sh passes (TEST=1 self-test + DEBUG
smoke test). PRUNE_LIVE's build was already broken before this commit
and remains identically broken after (confirmed via git stash).

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

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