feature: generate additional comments during jupyer2marimo notebook converter (for modified or redefined variables)

[bmerkle]

• enhance variable renaming with comments during notebook conversion
• comment for modified or redefined variable is attached for better understanding

📝 Summary

Enhanced variable renaming with contextual comments during Jupyter → marimo conversion.
When variables are renamed, modified, or redefined as part of the conversion process, explanatory comments are automatically attached. This improves traceability, preserves intent, and makes the resulting marimo notebook easier to understand and review—especially for non-trivial refactorings introduced during conversion.

🔍 Description of Changes

• for modified or redefined variable an additional python comment is generated

📋 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	Jan 5, 2026 10:51pm

[bmerkle]

I have read the CLA Document and I hereby sign the CLA

[dmadisetti]

Thanks for this.
Noticed a slight discrepancy in the tests.

If this is for reconstruction, then we need to account for in place operations

# ie
x += 1
# vs
x = x + 1