guardflow 0.2.0

Validators and a retry-until-valid guard for LLM output, in Rust
Documentation
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**What this changes and why**

**Checklist**
- [ ] `cargo test --all-targets --all-features` passes
- [ ] `cargo clippy --all-targets --all-features -- -D warnings` passes
- [ ] `cargo fmt --check` passes
- [ ] New public API has a test in `tests/`