Fix test mocks to use created_at instead of timestamp for Message objects

[Copilot]

Test mocks were setting .timestamp on Message objects, but the Message model (inheriting from MemoryEntry) uses .created_at. This mismatch caused tests to not properly validate production behavior.

Changes

• tests/unit/mcp/test_mcp_handlers.py: Changed mock_message.timestamp to mock_message.created_at (2 instances)
• tests/unit/integrations/test_google_adk.py: Changed mock_msg.timestamp to mock_msg.created_at (4 instances)

Production code in handlers.py and types.py was already correct - both use msg.created_at.isoformat() and msg.created_at respectively.

# Before: mock sets wrong attribute
mock_msg.timestamp = datetime.now()

# After: mock matches actual Message model
mock_msg.created_at = datetime.now()

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Project	Deployment	Actions	Updated (UTC)
agent-memory	Ready	Preview, Comment	Feb 5, 2026 2:38pm