Addresses 8 review comments on PR #5 covering unused imports, non-deterministic assertions, and overly broad exception handling in test_routes.py.

Import cleanup

• Removed unused MagicMock and top-level LockError imports

Deterministic test assertions

• test_enqueue_get_queue_length_exception: Changed assertIn(status_code, [201, 400]) to deterministic assertEqual(201) - when get_queue_length fails, enqueue proceeds with current_queue_length=0
• test_clear_queue_malformed_json: Now sends actual malformed JSON via client.request("DELETE", ...) instead of mocking

Exception handling specificity

• Replaced except Exception with except asyncio.CancelledError in lifespan tests
• Replaced bare except: with except asyncio.CancelledError
• Removed unused response variable in test_deep_status_exception

Test isolation improvements

• test_requeue_with_lock_lock_error: Properly mocks async context manager to exercise LockError path
• test_lifespaninitializes_queue: Stubs requeue_with_lock to prevent uninitialized queue access during startup/shutdown testing

# Before: non-deterministic
self.assertIn(response.status_code, [201, 400])

# After: deterministic with clear expectations
self.assertEqual(response.status_code, 201)
self.assertEqual(response.json()["status"], "queued")
self.assertEqual(response.json()["current_queue_length"], 0)

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