stillwater-sc / universal / 23121204101

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feat(unum1): implement arithmetic operators for unum Type I (#575)

Implement +, -, *, / via double-precision intermediate computation.
The operator=(double) encoder automatically finds the tightest unum
representation and sets ubit=1 when the result is inexact.

Features:
- All four arithmetic operators (+, -, *, /)
- Compound assignment (+=, -=, *=, /=)
- NaN propagation: any NaN operand produces NaN result
- Divide-by-zero throws unum_divide_by_zero when
  UNUM_THROW_ARITHMETIC_EXCEPTION is enabled
- Increment/decrement operators (++, --)

Test suite covers addition, subtraction, multiplication, division,
divide-by-zero exception, NaN propagation, and compound assignment.

Resolves #567

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

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