rust-pre-commit

## Weave pre-commit quality gate Run the three checks in order. Stop and report on the first failure — do not proceed to the next step if one fails. 1. `cargo fmt --all` — formats all code in place; then run `git diff --name-only` to list any files that were changed and need to be staged before committing 2. `cargo clippy -- -D warnings` — lint, deny all warnings 3. `cargo test` — run all unit + integration + E2E tests Report clearly: - Which checks passed ✓ - Which failed ✗ and what output was produced - What the developer needs to fix before committing