Cursor is moving over from cusorrules file to project rules (.mdc). See here for an example:
https://x.com/pontusab/status/1891605846821568920

Would be nice to build up a set of rules for the project. You can move stuff over from our current Cursor rules file.
To create a Cursor rule, Command-shift-P, then: "File: New Cursor Rule"

Don't take this task if you don't use Cursor as your editor :)

Note: we have some existing .mdc files but they feel overly complicated. The languine rules in the tweet seem better, so use that pattern for rules you add.