fix: publish first stable release as 0.1.0 (#143)

.github/workflows/release.yml

@@ -69,6 +69,20 @@ jobs:
       - name: Install Python dependencies
         run: uv sync --all-packages
 
+      - name: Prepare first stable release floor
+        if: ${{ inputs.release_kind == 'stable' }}
+        run: |
+          set -euo pipefail
+
+          stable_tags="$(git tag --merged HEAD --list 'v[0-9]*.[0-9]*.[0-9]*' | grep -v '-' || true)"
+          if [ -n "${stable_tags}" ]; then
+            exit 0
+          fi
+
+          root_commit="$(git rev-list --max-parents=0 HEAD | tail -n 1)"
+          git tag v0.0.0 "${root_commit}"
+          echo "KTX_STABLE_RELEASE_FLOOR_TAG=v0.0.0" >> "${GITHUB_ENV}"
+
       - name: Prepare next prerelease branch
         if: ${{ inputs.release_kind == 'rc' }}
         run: |