fix: add fetch-depth: 0 to collect-metrics workflow (#207)

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: kiyotis

.github/workflows/collect-metrics.yml

@@ -13,6 +13,8 @@ jobs:
       contents: write
     steps:
       - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0  # full history needed for git log origin/main (first commit date)
       - name: Collect metrics
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

tools/metrics/collect.py

@@ -162,7 +162,9 @@ def get_weeks_since_first_commit(repo_root: str) -> list[datetime]:
             while monday < current_monday:
                 weeks.append(monday)
                 monday += timedelta(weeks=1)
-            return weeks
+            if weeks:
+                return weeks
+            # weeks is empty when first commit is in the current week — fall through to fallback
     # Fallback: last 8 weeks
     now = datetime.now(tz=timezone.utc)
     current_monday = iso_week_monday(now)