DEVX-75: fix: remove tag fallback step from release workflow

.gitea/workflows/post-merge.yml

@@ -110,13 +110,6 @@ jobs:
           . .venv/bin/activate
           export PATH="$HOME/.local/bin:$PATH"
           python3 -m devx.ci.release
-      - name: Extract tag (fallback if GITHUB_OUTPUT not set)
-        if: steps.release-tag.outputs.tag == ''
-        run: |
-          tag=$(git describe --tags --abbrev=0 2>/dev/null || true)
-          if [ -n "$tag" ]; then
-            echo "tag=$tag" >> "$GITHUB_OUTPUT"
-          fi
       - name: Notify on failure
         if: failure()
         env: