Instruction file imported from GroepOnline/chefbar (.cursor/rules/chefbar-rust.mdc). Copyright stays with the author.

ChefBar Rust

• Edition 2021. Dependencies stay the current Cargo.toml set (gtk 0.18, ksni 0.2, ureq 2, clap 4, serde/serde_json, url, dirs, sha2, libc, pango, gdk). Do not add tokio/async/reqwest/thiserror/anyhow/mockall/proptest unless the task explicitly changes Cargo.toml and CI.
• Prefer &str / &[T] in parameters. Clone only when the snapshot or GTK boundary needs owned data.
• Fallible work returns Result; parsing of vault/ops JSON is tolerant (empty/default, never panic). unwrap/expect only in tests.
• Exhaustive match on RunSpec, UiCommand, HarnessKind, HarnessGroup, ActorCommand. Add a never default only for true closed enums if a _ would hide new variants — prefer listing every variant.
• Tests live in #[cfg(test)] in the same module (existing pattern). Name them after behavior, not methods.
• Gates: cargo fmt --all -- --check, cargo clippy --all-targets -- -D warnings, cargo test --all-targets.
• Module comments stay Dutch, matching the crate. Identifiers stay English.
• unsafe is not used today. Do not introduce it.

Generic skills rust-best-practices, rust-patterns, and rust-testing are allowed after these rules. Ignore their async/tokio/mockall chapters.