Minimize Rust FFI Crate Surface

Remove C symbols defined in a Rust FFI crate or file that are either unused or only used in C/C++ unit tests.

Arguments

• <path>: Path to the Rust crate or file.
• <path 1> <path 2>: Multiple Rust crates/files.

If the path doesn't start with src/, assume it to be in the src/redisearchrs/centrypoint directory. E.g. numericrangetreeffi becomes src/redisearchrs/numericrangetree_ffi. If the path points to a directory, review the documentation of all Rust files in that directory.

Instructions

• Use [analyze-rust-ffi-crate-surface](../analyze-rust-ffi-crate-surface/SKILL.md) to enumerate and analyze the usage of all the FFI symbols exposed by the Rust crate or file (e.g. extern "C" fn annotated with #[unsafe(no_mangle)] or type definitions).
• For each unused symbol:

- Delete its Rust definition. - Run C/C++ unit tests to ensure the symbol was indeed unused (via ./build.sh RUNUNITTESTS)

• For each symbol that is only used in C/C++ unit tests, elaborate a plan to either:

- Refactor the C/C++ unit tests not to use it. - Remove the C/C++ unit tests (or assertions) that rely on it, since they are prying into the implementation details of the Rust crate. - Keep the symbol, but mark it as "test only" in the Rust documentation.