Get the most recent MCP events (live activity feed).

Query params: limit (int, optional): Number of recent events to return (default 50, max 500)

Returns: { "events": [ { "timestamp": "2024-01-01T00:00:00Z", "agent_id": "agent_xxx", "tool_name": "search_flights", "response_time_ms": 150, "tier": "pro", "payment_cents": 10, "success": true }, ... ] }