Northstar Rust Audit

Thin explicit entrypoint for the canonical Rust audit-and-repair route.

1. Load references/router.md from the main northstar skill.
2. Select Rust explicit audit-and-repair and load references/modes/rust-quality-audit.md.
3. Follow that mode's scope, finding-first record, repair-wave, preservation, and completion-evidence contract.
4. Treat text after /northstar-rust-audit as the target and requested worktree or repository scope.

Do not activate from ordinary Rust coding, broaden repair authority, or mutate before the recorder contains the local finding and plan.