fix: Convert generator to list before indexing in ADK agent

[binbandit]

This PR fixes issue a2aproject/a2a-samples#38 where the ADK agent was attempting to index a generator object directly, which is not supported in Python.

Problem

In the invoke method of the ReimbursementAgent class, the code was trying to access events[-1] where events is a generator returned by self._runner.run(). Generators don't support indexing, which would cause a TypeError.

Solution

The fix converts the generator to a list before attempting to index it:

events = list(self._runner.run(
    user_id=self._user_id, session_id=session.id, new_message=content
))

[binbandit]

bump

[binbandit]

bump

[binbandit]

@kthota-g Could I please get a review?

[pstephengoogle]

I believe this is already fixed by an already merged PR. Please confirm

[mindpower]

Close this one since it's already fixed by a merged PR.