moonbitlang / core / 4706

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refactor(math): cache abs_x in cosh and harden boundary test

Address review feedback:
- Compute `x.abs()` once into a local `abs_x` at the top of `cosh` and
  reuse it across all branches, matching the style of `sinh` and avoiding
  redundant work.
- In the regression test, build the boundary value from its exact bit
  pattern 0x408633ce40000000 instead of a decimal literal (so the test
  cannot be silently weakened by rounding) and assert the round-trip;
  store the cosh results and check both is_inf and is_nan for each sign.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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