rpn: extract nAryMetricOp and nAryScalarOp helpers in hyper ops

Extract shared patterns from hyper operators:
- nAryMetricOp: metric resolution, category validation, base unit
  conversion, binary fn application, result conversion (used by
  HyperAdd, HyperSubtract)
- nAryScalarOp: applies binary fn to pre-converted float64 values
  and pushes with Cool metric (used by HyperDivide, HyperPower)

HyperMultiply stays inline (unique init-to-1 pattern).
HyperModulo stays inline (metric-aware with modulo-by-zero check).

Reduces operations_hyper.go from ~300 to ~268 lines.

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