fix: use inter-hub-pkg-rep for Gitea publish auth (WP-0005 T02)

Wire PACKAGE_USER into git clone URL and document inter-hub-pkg-rep as the
forge package-publish service account for PACKAGE_USER/PACKAGE_TOKEN.

.gitea/workflows/publish-python-package.yml

@@ -12,10 +12,11 @@ jobs:
     steps:
       - name: Check out source
         env:
+          PACKAGE_USER: ${{ secrets.PACKAGE_USER }}
           PACKAGE_TOKEN: ${{ secrets.PACKAGE_TOKEN }}
         run: |
           git clone --depth 1 \
-            "https://tegwick:${PACKAGE_TOKEN}@gitea.coulomb.social/coulomb/kaizen-agentic.git" \
+            "https://${PACKAGE_USER}:${PACKAGE_TOKEN}@gitea.coulomb.social/coulomb/kaizen-agentic.git" \
             repo
           cd repo
           git checkout "${{ gitea.sha }}"