diff --git a/.github/workflows/temp-post-modularization-fixes.yml b/.github/workflows/temp-post-modularization-fixes.yml
new file mode 100644
index 0000000..7cff6bf
--- /dev/null
+++ b/.github/workflows/temp-post-modularization-fixes.yml
@@ -0,0 +1,56 @@
+name: Temporary post-modularization regression fixes
+
+on:
+  push:
+    branches:
+      - fix/post-modularization-regressions
+    paths:
+      - tools/apply_post_modularization_fixes.py
+      - .github/workflows/temp-post-modularization-fixes.yml
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+jobs:
+  fix-and-test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: fix/post-modularization-regressions
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.9'
+      - name: Install dependencies on Python 3.9
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install -r requirements.txt
+          python -m pip install filelock
+      - name: Validate and apply fixes
+        run: |
+          python -m py_compile tools/apply_post_modularization_fixes.py
+          python tools/apply_post_modularization_fixes.py
+          python -m compileall -q .
+      - name: Run full suite on Python 3.9
+        run: python -m unittest discover -s tests -p 'test_*.py'
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+      - name: Install dependencies on Python 3.12
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install -r requirements.txt
+          python -m pip install filelock
+      - name: Run full suite on Python 3.12
+        run: |
+          python -m compileall -q .
+          python -m unittest discover -s tests -p 'test_*.py'
+      - name: Commit verified fixes 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_post_modularization_fixes.py .github/workflows/temp-post-modularization-fixes.yml
+          git add -A
+          git commit -m "fix: resolve post-modularization regressions"
+          git push origin HEAD:fix/post-modularization-regressions