Add executor_builder argument to A2AAgentServer

[jslane-h]

• Adds executor_builder argument to A2AAgentServer in order to have custom AgentExecutors
• Moved langgraph_chatagent_test.py from agents to agent_test folder

[Copilot]

Pull request overview

Adds an optional executor_builder callable to A2AAgentServer so callers can plug in custom AgentExecutor implementations instead of always using GenericAgentExecutor. Also relocates langgraph_chatagent_test.py from agents/ to the agent_test/ folder.

Changes:

• Add executor_builder: Callable[[BaseAgent], AgentExecutor] | None parameter to A2AAgentServer.__init__, defaulting to a lambda that constructs GenericAgentExecutor.
• Use self.executor_builder(self._agent) when constructing the DefaultRequestHandler in run().
• Move langgraph_chatagent_test.py into the agent_test/ directory.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

File	Description
automa_ai/common/agent_registry.py	Adds executor_builder constructor argument and uses it when creating the request handler.
automa_ai/agent_test/langgraph_chatagent_test.py	Relocated test file (contents unchanged) to the dedicated test folder.

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