dblock / excalc-rs / 36186640344

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Refactor: deduplicate WrongArgCount boilerplate

- stats.rs: average/min/max now reuse the existing
  require_at_least_one helper instead of hand-rolling the same "at
  least 1" error inline.
- eval.rs: generalized expect_args to work over any slice (not just
  &[f64]) and reused it in eval_user_function, eval_base_conversion,
  eval_conditional, and integration_setup, replacing four duplicated
  arity-check blocks.
- numbertheory.rs: gcd/lcm now share a new require_at_least_two
  helper instead of duplicating the same "at least 2" error inline.

No behavior change; full test suite (405 tests), fmt, and clippy all
pass.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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