v1.0.0: Guarantee no public function can panic

[GeEom]

No-panic guarantee:

• All public functions annotated with #[no_panic] under a dedicated verify-no-panic feature flag
• Subtraction, division, and abs replaced with saturating equivalents throughout
• Recursive sinh_cosh argument reduction converted to iterative with bounded depth
• Recursive atanh_core converted to a bounded reduction loop
• CI job checks annotation coverage and builds under no-panic-check profile

CI and documentation:

• --all-features replaced with --features std to avoid triggering verify-no-panic in normal builds
• Auto-tag on merge to main
• Advertise the robustness and accuracy ratchet in the readme
• Baseline updated to reflect saturating arithmetic changes

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 94.11765% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/traits.rs	50.00%	3 Missing ⚠️

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