enhancement(ai): add session_id to system_context

[bjoaquinc]

📝 Summary

Add current session_id to system_context so the Marimos internal AI system doesn't need to use the GetActiveNotebooks tool before pulling data from the current notebook.

🔍 Description of Changes

• Add _get_session_info() message with current session_id to get_chat_system_prompt()
• Update prompt tests to include dummy session_id

📋 Checklist

• I have read the contributor guidelines.
• For large changes, or changes that affect the public API: this change was discussed or approved through an issue, on Discord, or the community discussions (Please provide a link if applicable).
• I have added tests for the changes made.
• I have run the code and verified that it works as expected.

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Project	Deployment	Preview	Comments	Updated (UTC)
marimo-docs	Ready	Preview	Comment	Sep 19, 2025 5:40pm

[mscolnick]

nice!