Fix/median total order

[ysBach]

No description provided.

[Copilot]

🟢 Approval recommended

The changes are well-scoped, preserve documented preconditions (no-NaN “valid” buffers), and add comprehensive tests for the corrected edge cases.

Pull request overview

This PR improves floating-point order-statistics correctness by enforcing a total float ordering (not partial_cmp) and by computing the even-length median midpoint in an overflow-safe way, with added regression tests for edge cases (extremes, infinities, signed zero).

Changes:

• Switch order-statistics comparisons to a total float order via Float::total_cmp (supporting -0.0 vs 0.0 and infinities deterministically).
• Replace (lower + upper) / 2.0 with an overflow-safe midpoint(lower, upper) in the even-length median path.
• Add targeted tests covering overflow safety, infinities, and signed-zero semantics; ignore .worktrees/ in Git.

File summaries

File	Description
src/reducers_1d.rs	Use total ordering for float comparisons; introduce overflow-safe midpoint for even median; add extensive regression tests.
src/finite.rs	Add Float::total_cmp (default + f32/f64 overrides) to standardize total ordering across kernels.
.gitignore	Ignore .worktrees/ directory.

Review details

• Files reviewed: 2/3 changed files
• Comments generated: 0
• Review effort level: Lite

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