test : add unit tests for scoreDaysSinceLastCommit function

[tmdeveloper007]

Summary of What Needs to be Done:
Add unit tests for the scoreDaysSinceLastCommit 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 <= 7 days returns 15 points
• Test >= 30 days returns 0 points
• Test 7-30 day range scales linearly

Impact that it would Provide:

• Ensures recency scoring is correct
• Validates inactivity penalty calculation

[Harsh-Codes-77]

/assign

[github-actions]

✅ Closed as completed!

If DevTrack has been useful, a ⭐ star on the repo helps the project grow and reach more developers.