Set up ruff, add CI check

[chiroptical]

Summary

In Slack, https://cfb-public.slack.com/archives/C06A1S35Y56/p1762995502273639?thread_ts=1762910709.216609&cid=C06A1S35Y56, we agreed to set up some ruff CI checks. That would mean we also fix ruff checks in the current code.

Checklist

• On the frontend, I've made my strings translate-able.
• If I've added shared components, I've added a storybook story.
• I've made pages responsive and look good on mobile.
• If I've added new Firestore queries, I've added any new required indexes to firestore.indexes.json (Please do not only create indexes through the Firebase Web UI, even though the error messages may reccommend it - indexes created this way may be obliterated by subsequent deploys)

Screenshots

Add some screenshots highlighting your changes.

Known issues

If you've run against limitations or caveats, include them here. Include follow-up issues as well.

Steps to test/reproduce

For each feature or bug fix, create a step by step list for how a reviewer can test it out. E.g.:

1. Go to the home page
2. Click on a testimony
3. See that it's loaded with a loading spinner

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Project	Deployment	Preview	Comments	Updated (UTC)
maple-dev	Ready	Preview	Comment	Nov 19, 2025 1:28am

[chiroptical]

Would we like to do this on the analysis/ directory too?

[nesanders]

Per our Zoom discussion, lets scope it to llm/ since that's where we expect all of our python analysis scripts to live for now and we do not want to apply ruff to ipynb's that live elsewhere.