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fix: return NaN for degenerate z-scores, update scalar handling and add user warnings

Carlson Büthrequested to merge
dev into main
  • Adjusted z-score behavior to return NaN when the null ensemble has zero variance.
  • Normalised output now maintains scalar type parity with raw metric outputs.
  • Added user warning for link density normalisation, explaining degenerate cases.
  • Expanded test coverage for new behaviours and edge cases.
  • Updated documentation and changelog to reflect these changes.

Signed-off-by: Carlson Büth commit@cbueth.de

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