chore: group vitest dependabot updates

[mohanagy]

Summary

• group vitest and @vitest/coverage-v8 into the same Dependabot npm update batch
• extend package-metadata tests to enforce the grouping rule alongside version alignment

Test Plan

• npm run test:run -- tests/unit/package-metadata.test.ts
• npx -y node@20.20.2 ./node_modules/typescript/bin/tsc --noEmit
• npx -y node@20.20.2 ./node_modules/vitest/vitest.mjs run

Summary by CodeRabbit

• Chores

  • Updated Dependabot configuration to group test-related dependency updates into a single batch.

• Tests

  • Added validation for Dependabot grouping configuration.

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

📝 Walkthrough

Walkthrough

The changes add Dependabot grouping configuration to batch vitest and @vitest/coverage-v8 dependency updates into a single group, and introduce a unit test to validate this grouping configuration is properly set.

Changes

Cohort / File(s)	Summary
Dependabot Configuration .github/dependabot.yml	Adds a groups rule under the npm update entry to group vitest and @vitest/coverage-v8 dependency updates into a single named group called test-tooling.
Test Validation tests/unit/package-metadata.test.ts	Adds a helper function to read dependabot.yml and a new unit test that validates the presence of grouping configuration, the test-tooling group, patterns, and expected pattern strings for both test dependencies.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Poem

🐰 Hop, hop, the test tools align,
In groups they now bundle, so fine!
Vitest and coverage, together they stay,
And tests make sure they don't stray away! 🧪✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: grouping vitest and related dependencies in Dependabot configuration.
Description check	✅ Passed	The description covers the summary and testing sections, but omits the checklist and related issues sections from the template.
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.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/dependency-policy

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