Format signatures in LSP hover and completion documentation

[krassowski]

📝 Summary

• formats signatures using ruff so that they are easier to read
• depends on Allow to format signatures in docstrings python-lsp/python-lsp-server#631

🔍 Description of Changes

Adds pylsp_signatures_to_markdown hook, re-using existing ruff formatting utility.

Before	After

Note: this does not help with pd.read_csv; I am not sure why it is not hitting this code path, but notably it happens on the completion items which do not have a docstring either.

📋 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.

📜 Reviewers

@mscolnick

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
marimo-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 12, 2025 9:08am

[github-actions]

🚀 Development release published. You may be able to view the changes at https://marimo.app?v=0.13.7-dev34