Cache good/bad-bishop pawn-structure score in the pawn hash

iBishopColorScore[color][complex] is a pure function of pawn placement
(own/enemy, stationary/transient) on a bishop's color complex, so it
doesn't need rescanning per-bishop -- computed once per pawn-hash miss
in _EvalPawns and reused by every bishop of that color/complex in
_EvalBishop, mirroring the same cache-the-per-structure-invariant idea
already used elsewhere in eval.c.

Also disables two speculative check-extension/futility-gating
experiments in search.c (#if 0, not deleted -- kept for reference)
that didn't hold up, and adds the BBLEFT/BBRIGHT bitboard constants
eval.c's bishop-mobility rewrite needs.

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

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