add minimal gitignore

[maxheld83]

I'm used to using direnv on all repos with a flake.nix, so got some spurious diffs.

Summary by CodeRabbit

• Chores
  • Updated version control configuration to exclude development build artifacts and local environment directories from the repository.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: b5e9e01a-bc16-4755-9b83-40814289c1cd

📥 Commits

Reviewing files that changed from the base of the PR and between 57a29b4 and ce4784e.

📒 Files selected for processing (1)

• .gitignore

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📝 Walkthrough

Walkthrough

Added ignore patterns to .gitignore for Nix build artifacts (result*) and direnv's local environment directory (.direnv) to exclude these files from version control.

Changes

Cohort / File(s)	Summary
Configuration .gitignore	Added ignore patterns for Nix build artifacts (result*) and direnv local environment directory (.direnv).

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 Nix builds and direnv trails, now hidden from sight,
Our .gitignore grows stronger, keeping repos clean and bright,
Three little lines of pure delight, tucking secrets away so tight! ✨

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	The description provides context for the change but lacks detail about what patterns are being ignored and doesn't follow the template structure that includes formatting instructions.	Expand the description to explain which ignore patterns were added (Nix artifacts and .direnv) and consider addressing the formatting template guidelines.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'add minimal gitignore' clearly and specifically describes the main change—adding a .gitignore file to the repository.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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