[BryanFRD]

Summary

• Add cargo fmt --check to enforce consistent formatting
• Add cargo clippy -- -D warnings to catch lint issues
• Add cargo test to run unit tests in CI

All three steps run before the build step so failures are caught early.

Closes #53

[Copilot]

Pull request overview

This PR updates the CI workflow to run Rust formatting, linting, and unit tests for the generator crate before building and generating fixtures, ensuring failures are caught earlier in the pipeline.

Changes:

• Add cargo fmt --check to enforce Rust formatting in CI
• Add cargo clippy -- -D warnings to fail CI on clippy warnings
• Add cargo test to run unit tests in CI before the build step

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[Copilot]

cargo fmt and cargo clippy require the rustfmt and clippy rustup components. The workflow installs dtolnay/rust-toolchain@stable without specifying components, so these steps may fail on runners where the components aren’t preinstalled. Consider configuring the toolchain step with components: rustfmt, clippy (or explicitly running rustup component add rustfmt clippy) to make CI deterministic.