Test if git is used without flagging

.github/workflows/ci.yml

@@ -266,6 +266,16 @@ jobs:
         with:
           tool: cargo-nextest
 
+      - name: "Disable git"
+        run: |
+          # Create a fake git that will be found first in PATH
+          mkdir -p /tmp/fake-bin
+          echo '#!/bin/bash
+          echo \'Error: `git` operations are not allowed — are you missing a cfg for the `git` feature?\' >&2
+          exit 1' > /tmp/fake-bin/git
+          chmod +x /tmp/fake-bin/git
+          echo "PATH=/tmp/fake-bin:$PATH" >> $GITHUB_ENV
+
       - name: "Cargo test"
         working-directory: ${{ env.UV_WORKSPACE }}
         env: