Capture log messages from agent and its immediate tools in AgentTracker output

This PR implements the functionality to capture log messages from an agent and its immediate tools (at log, warn, and error levels) and include them in the output returned by the agentMessage tool.

Changes

• Added a log listener in agentStart.ts that captures log, warn, and error level messages from the agent and its immediate tools
• Filtered logs based on nesting level to avoid capturing logs from deeper nested tools
• Updated agentMessage.ts to include the captured logs in the output with a clear section header
• Added comprehensive tests to verify the log capturing functionality

Testing

• Added a new test file (logCapture.test.ts) that verifies:
  • Only logs at the specified levels (log, warn, error) are captured
  • Only logs from the immediate agent and its direct child tools are captured
  • Logs from deeper nested tools are not captured
  • Logs are properly formatted with prefixes based on log level

Related Issues

Fixes #324