stillwater-sc / universal / 23120256353

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feat(unum1): implement comparison operators with NaN semantics (#574)

Implement value-based comparison operators for unum Type I:
- operator== compares by decoded value (not bit pattern), so
  equivalent values with different esize/fsize are equal
- NaN follows IEEE-754 semantics: NaN != NaN, all ordered
  comparisons with NaN return false
- Zero equality: two zeros are always equal regardless of encoding

Add comprehensive logic test suite covering equality, inequality,
less-than, greater-than, less-equal, greater-equal, NaN semantics,
and zero comparisons.

Update api.cpp NaN equality test to match IEEE semantics.

Resolves #566

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

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