feat: Add support for AUTO_CREATE_PR automation mode

[sashimikun]

This change updates the Jules Agent SDK to support the new AUTO_CREATE_PR automation mode. It adds an optional automation_mode parameter to the sessions.create method, allowing users to create sessions that automatically generate a pull request upon completion.

[gemini-code-assist]

Summary of Changes

Hello @sashimikun, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces support for the AUTO_CREATE_PR automation mode within the Jules Agent SDK. It enables users to configure sessions that automatically generate a pull request upon completion by adding an automation_mode parameter to the session creation process, enhancing the SDK's capabilities for automated workflows.

Highlights

• Model Update: The Session model in src/jules_agent_sdk/models.py has been updated to include an optional automation_mode field, which is a string representing the automation mode for a session.
• API Method Enhancement: The sessions.create method in src/jules_agent_sdk/sessions.py now accepts an optional automation_mode parameter, allowing users to specify the desired automation behavior when creating a new session.
• New Test Case: A new test case, test_sessions_create_with_automation_mode, has been added to tests/test_client.py to ensure that sessions can be successfully created with the AUTO_CREATE_PR automation mode and that the parameter is correctly passed in the API request.

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[gemini-code-assist]

Code Review

This pull request adds support for the AUTO_CREATE_PR automation mode when creating a session. The changes are well-implemented across the data models, API methods, and tests. The new automation_mode parameter is added to sessions.create, and a corresponding test case verifies its functionality. My main feedback is a suggestion to use an Enum for automation_mode to improve type safety and maintainability, which I've detailed in a specific comment.

[gemini-code-assist]

For better type safety and maintainability, consider defining an Enum for automation_mode. This prevents typos and makes it clear what values are supported by the API. If AUTO_CREATE_PR is the only mode for now, you can start with that.

For example:

from enum import Enum

class AutomationMode(str, Enum):
    """Automation mode for a session."""
    AUTO_CREATE_PR = "AUTO_CREATE_PR"

# Then in the Session class:
...
    automation_mode: Optional[AutomationMode] = None
...

# In from_dict:
...
automation_mode_str = data.get("automationMode")
automation_mode = AutomationMode(automation_mode_str) if automation_mode_str else None
...

# In to_dict:
...
if self.automation_mode:
    result["automationMode"] = self.automation_mode.value
...

You would also need to update the sessions.create method signature to accept Optional[AutomationMode] and pass its value.