ci: use ubuntu-slim for linting

[MindTooth]

Switch the Vim lint job to GitHub's lightweight ubuntu-slim runner. Python is selected explicitly with setup-python, and the job only installs and runs Vint.

Summary by CodeRabbit

• Chores
  • Lint checks now run on an updated hosted runner environment. The checks and their behavior remain unchanged, with no changes to the product experience.

[coderabbitai]

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: 3ad9a03d-6596-4aa0-81ff-9d5ff20a2348

📥 Commits

Reviewing files that changed from the base of the PR and between d4889a8 and 29829f9.

📒 Files selected for processing (1)

• .github/workflows/lint.yaml

Included review availability: This review used your included allowance. Your plan provides up to 4 included reviews per hour; 3 remain after this review.

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📝 Walkthrough

Walkthrough

The lint job now runs on ubuntu-slim instead of ubuntu-latest. Its remaining steps are unchanged.

Changes

Lint runner update

Layer / File(s)	Summary
Update lint job runner .github/workflows/lint.yaml	The lint job now uses ubuntu-slim instead of ubuntu-latest. Its remaining steps are unchanged.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~2 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to 29829

The lint job’s execution environment changes, but its documented tool requirements are supported and no concrete breakage is evident. It appears ready for normal CI validation.

Architecture Summary

Architecture risk: 🔵 Low · up to 29829

The changed surface does not map to a changed system, dependency edge, entrypoint, or external dependency.

Changed systems: None identified.

Architecture concerns
No architecture-level concerns identified.

Review details

Before / after behavior

• observed — Modified behavior in .github/workflows/lint.yaml: The lint job’s runner changed from ubuntu-latest to ubuntu-slim.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: updating the lint job to use the ubuntu-slim runner.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Commit to this branch
• Create a new PR

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