//! Verification test for readme.md example code
//!
//! This test ensures that the example code shown in readme.md actually compiles
//! and runs correctly. This prevents documentation drift.
// NOTE: The readme.md example uses tests_impls!/tests_index! macros from impls_index,
// which is not available as a macro in test_tools standalone mode (only a module placeholder
// exists to break the impls_index_meta → macro_tools → test_tools circular dependency).
// The macro-based example can only be verified when impls_index is a direct dep.
//
// Placeholder test to keep this file compilable.