ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

✅ ecosystem check detected no linter changes.

Added an integration test, but I want to hold off on including *.md by default in this PR, for a couple reasons:

• I think it's a big enough change that we should have a separate line item in a changelog, and that's more likely to happen with a dedicated PR
• Micha had a concern around how we handle file discovery and when we show the error message "no python files found", and especially for linting where we don't yet operate on markdown files, we should perhaps have some more nuanced behavior, or at the very least consider if we want to change the error message

#23434 has a draft PR to add *.md to the default include list in preview mode.

Moved the test case, and also added a short blurb to the configuration documentation.

Does this require any changes to Ruff's VS Code extension/LSP? Seems tricky, so maybe not something we need to solve now but it might be worth opening an issue.

I did update the LSP to declare that it supports the Markdown file format, which means if the editor determines the file contents is Markdown, then it should automatically be able to ask Ruff to format it, and same thing for the Python file formats, and as long as Ruff is configured correctly, it should be willing to format that file accordingly.

That said, I just tested this in vscode by creating a Markdown file with a random extension, and then setting it's file type in the editor as Markdown — that gives me the option to Format Document With... and select Ruff, but then it got No result returned, so I'll open an issue and see if I can debug that at some point.

Filed astral-sh/ruff-vscode#974