Fix near-tied ensemble weights in both scoring directions - #144
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Near-tied losses previously produced winner-take-all weights in the default minimization path. Use direction-aware exponential utilities with a documented temperature in score units, preserving shared weight near ties and handling signed/zero scores. Validate inputs and stabilize extreme score gaps.
Closes #140.
Validation:
just ci(format, lint, strict mypy, full coverage suite); regression cases for both directions, exact/near ties, signed scores, unit scaling, invalid inputs, and extreme values.