run-checkslisted

## Steps Execute the following in order. If a step fails, fix the issue before proceeding to the next step. ### 1. Format check ```bash cargo fmt --check ``` If this fails, run `cargo fmt` and then re-verify. ### 2. Clippy (warnings as errors) ```bash cargo clippy -- -D warnings ``` If this fails, fix each clippy finding. When suppressing with `#[allow(...)]`, always include a reason comment. ### 3. Tests ```bash cargo test ``` Fix any failing tests. If snapshots (`insta`) were updated, run `cargo insta review` to inspect the diff before accepting. ### Completion condition Report completion once all 3 steps pass with exit code 0.