Add small static penalties for trapped pieces in _EvalTrappedPieces.

Eval() already detects trapped/attacked pieces (for search hints via
RecordEnprisePieceAtPly/RecordTrappedPiece) but never penalized them in
the static score. Add two named, DNA-visible constants: a larger flag
for the opponent-to-move/imminently-capturable case, a smaller one for
the own-move/still-might-escape case -- flat "this is bad" nudges, not
an attempt to price the material outcome, which search still owns.

Verified flat on ecm_ringers/ecm_confident_quick vs head_reference at
sd 10; ecm_hard_quick's lone flip (ECM.370) is a search-instability
artifact of that specific position (its true evaluation was still
moving through depth 14 in independent runs), not a real regression.

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