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AGENTS.md

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+# Development
+
+- Prefer simple, idiomatic Rust; reuse existing code and dependencies before adding abstractions or crates.
+- Keep changes focused, handle errors explicitly, and add the smallest useful test for non-trivial behavior.
+- Preserve `rustfmt` output and keep Clippy warning-free.
+
+## Commit gates
+
+Run before every commit:
+
+```sh
+cargo fmt --all -- --check
+cargo clippy --all-targets --all-features -- -D warnings
+cargo build --all-targets --all-features
+cargo test --all-features
+```
+
+## Commit messages
+
+Use a short, imperative subject describing one change. Skip prefixes and bodies unless they add necessary context.