chore: import upstream snapshot with attribution

.github/workflows/stats.yml

@@ -0,0 +1,25 @@
+name: Adoption stats (maintainer-only)
+# Posts unified PyPI install + docs-traffic numbers to the workflow run summary,
+# which is visible ONLY to repo collaborators. Nothing is published publicly.
+on:
+  schedule:
+    - cron: '0 6 * * *'
+  workflow_dispatch: {}
+permissions:
+  contents: read
+jobs:
+  stats:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with: { node-version: 20 }
+      - name: Fetch + summarize stats (private to collaborators)
+        env:
+          # public stars/forks work with the default token; unique cloners/viewers
+          # need a maintainer PAT with Administration: read (STATS_GITHUB_TOKEN).
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          STATS_GITHUB_TOKEN: ${{ secrets.STATS_GITHUB_TOKEN }}
+          GOATCOUNTER_TOKEN: ${{ secrets.GOATCOUNTER_TOKEN }}
+          GOATCOUNTER_SITE: ${{ secrets.GOATCOUNTER_SITE }}
+        run: node website/scripts/fetch-stats.mjs >> "$GITHUB_STEP_SUMMARY"