auto fixes from ruff

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📝 Summary

This is a slow migration to use the newest version of ruff which has more rules. https://github.com/astral-sh/ruff/releases
Ran uvx ruff check --fix. Went through the changes, they all look good.

🔍 Description of Changes

📋 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).
• Tests have been added for the changes made.
• Documentation has been updated where applicable, including docstrings for API changes.
• Pull request title is a good summary of the changes - it will be used in the release notes.

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Project	Deployment	Actions	Updated (UTC)
marimo-docs	Ready	Preview, Comment	Feb 23, 2026 6:34pm

[dmadisetti]

We might consider disabling the rule that removes trailing returns.
We use return currently to delimit the end of a cell. So a cell like:

@app.cell
def _():
    print("running internal tests")
    # Some comments about the test we want to run
    # will get removed. Added whitespace too.




    return

May remove the comments/whitespace when formatting with ruff.
We've attempted to keep parity with ruff's formatting, and could probably support the stripped return when there is not whitespace on the last line.

[dmadisetti]

Required for the failing test, but you could make this any expression

[dmadisetti]

I wouldn't mind revisiting this. My local ruff got bumped, and ran into this accidentally