MaterialValues

The centipawn scale every engine-side evaluation and safety metric is priced in (#510).

The values are the classical relative piece values scaled by 100, so a pawn is the unit and integer arithmetic carries fractional-pawn precision without floating point on a hot path.

'''Why this is a shared object and not a constant on Evaluator.''' Two consumers must agree on it by construction, not by convention: Evaluator prices positions, and PieceSafety prices the material a side has en prise — the arena's hang telemetry. Those two numbers are compared against each other in practice ("did the safety signal reduce the blunders the telemetry counts"), which only means something while both use one scale. PieceSafety is the lower-level primitive of the pair, so having it reach into the evaluator for a rook's price would invert the layering; both depend on this instead.

'''The king is priced, unlike in ordinary chess evaluators.''' Dice Chess is won by actually capturing the king rather than by mate, so a king is a capturable piece whose loss ends the game — Evaluator.evaluateMaterial gives it a value far above the rest of the army so no material gain can outweigh losing it. PieceSafety never needs it: an attacked king is check, a separate concept with its own machinery, and hangingSquares excludes kings by construction.