Implement Real Execution for Coordination Tests

[aviralgarg05]

Description

The agentunit multiagent test-coordination command in src/agentunit/cli/__init__.py currently performs a dry run using MockAgent.
It outputs zeroed metrics and does not test actual coordination.

Task

• Update the command to use AdapterFactory to create real agents based on the --adapter flag.
• Execute actual message exchanges.
• Collect and report real metrics (latency, token usage, etc.).

Source

https://github.com/aviralgarg05/agentunit/blob/main/src/agentunit/cli/__init__.py#L320