axonflow-sdk-rust 0.1.0

Rust SDK for the AxonFlow AI governance platform
Documentation
## Summary

<!-- 1-3 bullets on what this PR changes and why. -->

## Test plan

<!-- How to verify. e.g. `cargo test`, specific scenarios, manual steps. -->

```bash
cargo fmt --check
cargo clippy --all-targets --all-features -- -D warnings
cargo test --all-features
```

## Contributor acknowledgement

- [ ] I have signed off every commit per the [Developer Certificate of Origin]https://developercertificate.org/ (`git commit -s`)
- [ ] I have read and agree to the repo's `CONTRIBUTING.md`
- [ ] I certify my contribution is mine to submit (no employer or third-party rights conflict) and will be released under this repo's license — MIT
- [ ] Internal contributors only Issue/branch tracked: #<issue> / `<branch>`