DROP BEFORE MERGE: build against firedrakeproject/fiat#268

EnrichedElement has no dual basis without it, so interpolating into the
facet space of a hexahedron raises NotImplementedError, and gem cannot
unconcatenate a dual basis whose blocks have already been contracted with
a Cofunction.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: pbrubeck

.github/actions/install/action.yml

@@ -163,6 +163,14 @@ runs:
         firedrake-clean
         pip list
 
+    - name: "DROP BEFORE MERGE: install FIAT from firedrakeproject/fiat#268"
+      shell: bash
+      run: |
+        . venv/bin/activate
+        pip install --verbose --no-build-isolation --no-deps --force-reinstall \
+          git+https://github.com/firedrakeproject/fiat.git@pbrubeck/fix/dual-enriched
+        pip list | grep -i fiat
+
     - name: Run firedrake-check
       shell: bash
       run: |