- Test mutex construction (default and named)
- Test lock/unlock operations
- Test try_lock functionality
- Test timed lock with various timeout values
- Test critical section protection
- Test concurrent access and contention scenarios
- Test inter-thread synchronization with named mutex
- Test resource cleanup (clear, clear_storage)
- Test native handle access
- Test edge cases (reopen, zero timeout, rapid operations)
- Test exception safety of try_lock
- Test low-level API (acquire, get_mem, release, remove)
- Test reference counting functionality (get_ref, sub_ref)
- Test high-level handle class interface
- Test all handle methods (valid, size, name, get, etc.)
- Test handle lifecycle (construction, move, swap, assignment)
- Test different access modes (create, open, create|open)
- Test detach/attach functionality
- Test multi-handle access to same memory
- Test data persistence across handles
- Test edge cases (large segments, multiple simultaneous handles)
- Test all constructors (default, with destructor, from array, from char)
- Test move semantics and assignment operators
- Test all accessor methods (data, size, empty, get<T>)
- Test conversion methods (to_tuple, to_vector)
- Test comparison operators (==, !=)
- Test edge cases (empty buffers, large buffers, self-assignment)
- Verify destructor callback functionality
- Move all existing test files (*.cpp, *.h) to test/archive/
- Rename CMakeLists.txt to CMakeLists.txt.old in archive
- Prepare for comprehensive unit test refactoring
