Update performance test workflow to use editable install for dependencies

Author: Robbie1977

.github/workflows/performance-test.yml

@@ -27,7 +27,7 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           python -m pip install --upgrade -r requirements.txt
-          python -m pip install .
+          python -m pip install -e .  # Editable install ensures we test the actual source code
           
       - name: Run Performance Test
         run: |