rust-rapport 0.2.0

Formats cargo clippy JSON output for GitHub Actions (step summary, PR annotations, human-readable).
Documentation 
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## Summary

<!-- What does this PR change? One or two sentences. -->

## Motivation

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## Testing

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## Checklist

- [ ] `cargo fmt --all --check` passes
- [ ] `cargo clippy --all-targets --all-features --locked -- -D warnings` passes
- [ ] `cargo test --all-features --locked` passes
- [ ] `CHANGELOG.md` updated under `[Unreleased]` (unless purely internal)