diff --git a/.github/workflows/temp-full-safe-modularization.yml b/.github/workflows/temp-full-safe-modularization.yml
new file mode 100644
index 0000000..f4c1cb9
--- /dev/null
+++ b/.github/workflows/temp-full-safe-modularization.yml
@@ -0,0 +1,44 @@
+name: Temporary full safe modularization
+
+on:
+  push:
+    paths:
+      - tools/apply_full_safe_modularization.py
+      - .github/workflows/temp-full-safe-modularization.yml
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+jobs:
+  modularize:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+      - name: Install project dependencies
+        run: |
+          python -m pip install --upgrade pip
+          if [ -f requirements.txt ]; then python -m pip install -r requirements.txt; fi
+          python -m pip install filelock
+      - name: Apply safe modularization
+        run: python tools/apply_full_safe_modularization.py
+      - name: Verify Python syntax
+        run: python -m compileall -q .
+      - name: Run full unit test suite
+        run: python -m unittest discover -s tests -p 'test_*.py'
+      - name: Commit modularized source and cleanup
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          git rm -f \
+            tools/apply_full_safe_modularization.py \
+            tools/build_refactor_inventory.py \
+            refactor_inventory.json \
+            .github/workflows/temp-refactor-inventory.yml \
+            .github/workflows/temp-full-safe-modularization.yml
+          git add -A
+          git commit -m "refactor: modularize registration runtime safely"
+          git push