Stub reader-magnet welcome course, active: false pending Cate's story

Placeholder welcome-email copy in Cate's voice (Fantasy Michigan), wired
end-to-end but not enrollable until the real manuscript/cover/epub land.

.gitea/workflows/sync.yml

@@ -0,0 +1,26 @@
+name: Sync courses
+on:
+  push:
+    branches: [master]
+
+jobs:
+  sync:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Package and sync
+        run: |
+          tar czf /tmp/courses.tar.gz courses
+          status=$(curl -s -o /tmp/sync-response.json -w '%{http_code}' \
+            -X POST "http://eec-cateconners:8080/admin/sync" \
+            -H "Authorization: Bearer ${CATECONNERS_EEC_SYNC_TOKEN}" \
+            --data-binary @/tmp/courses.tar.gz)
+          cat /tmp/sync-response.json
+          echo
+          if [ "$status" -ge 300 ]; then
+            echo "sync failed with status $status"
+            exit 1
+          fi
+        env:
+          CATECONNERS_EEC_SYNC_TOKEN: ${{ secrets.CATECONNERS_EEC_SYNC_TOKEN }}