chore: update .gitignore

[bashrusakh]

Update .gitignore to improve project hygiene.

Summary by CodeRabbit

• Chores
  • Updated ignored files to include graymatter, helping keep generated or packaged artifacts out of source control.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: f1103c95-2f0f-41a5-8578-57b9d15e2db5

📥 Commits

Reviewing files that changed from the base of the PR and between 9b725dd and 9748a14.

📒 Files selected for processing (1)

• .gitignore

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📝 Walkthrough

Walkthrough

The PR adds graymatter to the repository’s .gitignore file.

Changes

Graymatter ignore update

Layer / File(s)	Summary
Add graymatter to ignore list .gitignore	graymatter is added to the existing ignore list entry.

Sequence Diagram(s)

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 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 is concise and accurately describes the only substantive change: an update to .gitignore.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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)

• Create PR with unit tests
• Commit unit tests in branch chore/update-gitignore

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