fix(deepagents): add integration test for subagent responseFormat

[Maahir Sachdev (maahir30)]

Adds an integration test that verifies the end-to-end flow when responseFormat is set directly on a SubAgent spec. The test confirms that the subagent's structuredResponse is JSON-serialized into the ToolMessage content returned to the parent agent. This path was previously only covered by a unit test that mocked the subagent output directly, skipping the createAgent + responseFormat integration.

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Latest commit: 39dd5fa

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commit: 39dd5fa

[Christian Bromann (christian-bromann)]

Noice 🙌