test : add unit tests for scoreCommitFrequency function

[tmdeveloper007]

Summary of What Needs to be Done:
Add unit tests for the scoreCommitFrequency function in src/lib/repo-health.ts. Tests must use vitest framework and import actual source code.

Changes that Need to be Made:

• Create test using vitest describe/it/expect
• Test 10+ commits returns 25 points
• Test linear scaling below 10 commits
• Test 0 commits returns 0

Impact that it would Provide:

• Ensures commit scoring is correctly weighted
• Validates linear scaling formula

[Harsh-Codes-77]

/assign

[github-actions]

✅ Closed as completed!

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