totp-rfc 0.1.2

Security-hardened, allocation-free no_std HOTP and TOTP for Rust with strict RFC 4226/6238 behavior
Documentation 
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## Summary

<!-- What changes, and why is this the smallest appropriate change? -->

## Specification and security impact

<!-- Link relevant RFC sections. Describe effects on secrets, timing, replay, counters, or windows. -->

## Verification

- [ ] `cargo fmt --all -- --check`
- [ ] `cargo test --all-features`
- [ ] `cargo test --no-default-features`
- [ ] `cargo clippy --all-targets --all-features -- -D warnings`
- [ ] RFC vectors or focused regression tests added where behavior changed
- [ ] Public API and security documentation updated

## Compatibility

<!-- Note MSRV, no_std, SemVer, interoperability, or migration implications. -->