fix: serialize run sessions in cell order

[jpopesculian]

📝 Summary

When running the notebook with the RUN command, the session gets serialized out of order if the cells execute out of order. This makes the serialized session unusable as it will not be a "cache_hit". The SessionCacheManager doesn't currently have access to the cell_ids to serialize the cells in order.

🔍 Description of Changes

The change here adds a cell_ids_provider to the SessionCacheManager in order for it to have knowledge of the cell_ids.

📋 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	Review	Updated (UTC)
marimo-docs	Ready	Preview, Comment	Dec 28, 2025 10:32am

[github-actions]

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[jpopesculian]

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[mscolnick]

It might be a bug/oversight that this is even enabled for run mode. I'd imagine that showing previous sessions would be undesired since you'd have different users overwriting each other (and potentially with different info that doesn't make sense).