bind interface and refactor doc

AGENTS.md

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+# Repository Instructions
+
+## Rust Rules
+
+- In Rust code, do not introduce `unwrap()` or `expect()`.
+- Allowed exceptions:
+- Tests may use `unwrap()` or `expect()` when it keeps the test focused and readable.
+- Lock acquisition may use `unwrap()` only when the locking API makes that the practical option and the failure mode is poison handling rather than normal control flow.
+- Outside those exceptions, propagate errors, handle them explicitly, or use safer fallbacks instead of `unwrap()` and `expect()`.
+
+## Editing Hygiene
+
+- Do not introduce formatting-only changes.
+- Do not run repository-wide formatters or reflow unrelated code unless the
+  user explicitly asks for formatting.
+- Keep diffs limited to semantic changes required for the task.
+