Session and Message Handling

What changed: Enhanced session lifecycle hooks and message tracking capabilities.

Details:

• A22() and WW5() provide session hook registration system
• nA0() extracts message/tool/tooluse IDs from messages
• Xk2() groups tool uses for grouped rendering
• ITQ() renders grouped tool use messages
• $RQ() implements rate-limited messaging
• WeA() and FeA() track message sources
• Evidence: A22(), WW5() for session hooks, nA0() for ID extraction, Xk2() for grouping, ITQ() for rendering