gatewarden 0.3.0

Hardened Keygen.sh license validation infrastructure
Documentation 
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⚠️ **Gatewarden does not accept unsolicited pull requests.**

If you were not invited to submit this PR via email discussion with the maintainer,
it will be closed without review. See [CONTRIBUTING.md](../blob/master/CONTRIBUTING.md).

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## Summary


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## Prior Discussion


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## Checklist


- [ ] Contribution was pre-approved by maintainer via email
- [ ] `cargo fmt --check`
- [ ] `cargo clippy --workspace -- -D warnings`
- [ ] `cargo test --workspace`
- [ ] No license keys or secrets in logs/errors
- [ ] Docs updated (if behavior or API changed)