fix(queue): prevent duplicate message send (race condition) #72
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🐛 Problem
Concurrent workers can enqueue identical messages, producing duplicate outputs and potential double-billing.
🔧 Fix
Adds
DuplicateGuardQueuewith✅ Test
pytest -q test_duplicate_send.py→ green (1 passed)📄 Files
queue_stub.py→ minimal guard implementationtest_duplicate_send.py→ multithread regression testproject_types.py→ rename to avoid stdlib clashCloses: #