fix: follow ruff rules for formatting trailing space after imports/ functions

[dmadisetti]

📝 Summary

Ruff expects a new blank line after class defs, functions, and imports. Currently, we get rid of this extraneous spacing (and ruff doesn't detect it since we format without the return).

This pr introduces detection for the required spacing, with a little bit of extra logic to handle trailing comments.

closes #7526

---

Seems like we already handle the single trailing line case:

def _():
    import marimo
    
    return

def _():
    import marimo


    return

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
marimo-docs	Ready	Preview, Comment	Feb 3, 2026 0:32am