chore: fix clippy warnings

testing/sqlite_test_ext/src/lib.rs

@@ -7,6 +7,13 @@ extern "C" {
 }
 
 #[no_mangle]
+/// Initialize the Limbo SQLite Test Extension.
+///
+/// # Safety
+///
+/// This function is unsafe because it interacts with raw pointers and FFI.
+/// Caller must ensure that `db`, `err_msg`, and `api` are valid pointers,
+/// and that the SQLite database handle is properly initialized.
 pub unsafe extern "C" fn sqlite3_limbosqlitetestext_init(
     db: *mut std::ffi::c_void,
     err_msg: *mut *mut i8,