- All ClientManager methods (add_client, get_client, remove_client,
get_wait_time, is_server_full, is_client_timeout) now protected by
a threading.Lock
- cleanup() called outside the lock to avoid holding it during I/O
- is_server_full() computes wait time inline under lock instead of
calling get_wait_time() to avoid nested lock acquisition
- Added concurrent thread safety tests for add/remove and get operations
Aaron Boxer
81cdbbca95