NameError: name 'task' is not defined

Issue will occur at line:
https://github.com/google-a2a/a2a-samples/blob/cfb64a3f9f5b8ffe4de25717b53175880465c69c/samples/python/hosts/multiagent/host_agent.py#L186

Following line needs to be corrected for the issue: https://github.com/google-a2a/a2a-samples/blob/cfb64a3f9f5b8ffe4de25717b53175880465c69c/samples/python/hosts/multiagent/host_agent.py#L168

The issue points to two lines in host_agent.py: line 186 where the error occurs, and line 168 which needs correction. Open the file, examine the variable scope around line 168 to see where 'task' should be defined or imported. The fix is likely a simple variable definition or import. After editing, run the script or relevant tests to ensure the NameError is resolved.

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