Add thread-safety to _CounterMeta class creation counter

[Copilot]

The _class_creation_counter in _CounterMeta was susceptible to race conditions during concurrent class creation, potentially causing duplicate _class_id values.

Changes

• Thread-safe counter increment: Wrap _class_id assignment and counter increment in threading.Lock to ensure atomicity
• Verification test: Add test_thread_safe_class_creation() that creates 100 classes across 10 concurrent threads and validates unique IDs

class _CounterMeta(abc.ABCMeta):
    _class_creation_counter: int = 0
    _counter_lock: threading.Lock = threading.Lock()

    def __init__(cls, name, bases, dct):
        super().__init__(name, bases, dct)
        with _CounterMeta._counter_lock:
            cls._class_id = _CounterMeta._class_creation_counter
            _CounterMeta._class_creation_counter += 1

Addresses feedback on PR #3.

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[igor-holt]

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