<!-- Thanks for contributing to Killer! -->##What & why<!-- What does this change do, and why? Link any related issue (e.g. Closes #12). -->##Checklist-[ ] `cargo fmt --all` (and `cargo fmt --check` is clean)
- [ ] `cargo clippy --all-targets` is warning-free
- [ ] `cargo test` passes
- [ ] Docs updated if behavior/CLI/`.klr` changed (`docs/`, README, `CHANGELOG.md`)
- [ ] No new capability is claimed that isn't implemented and tested
##Notes for reviewers<!-- Anything that needs special attention, trade-offs, or follow-ups. -->