Reintroduce PYHELIOS_DEV_MODE in workflows for quick test runs

- Add `PYHELIOS_DEV_MODE` environment variable to relevant steps in `test-quick.yml` for development mode testing.
- Ensure isolated, quick feedback during essential and smoke tests.

Author: bnbailey-psl

.github/workflows/test-quick.yml

@@ -30,17 +30,23 @@ jobs:
         pip install -e .
 
     - name: Quick smoke test
+      env:
+        PYHELIOS_DEV_MODE: 1
       run: |
         python -c "import pyhelios; print('✓ PyHelios imports successfully')"
         python -c "from pyhelios.plugins import print_plugin_status; print_plugin_status()"
 
     - name: Run essential tests only
+      env:
+        PYHELIOS_DEV_MODE: 1
       run: |
         # Run only the most critical tests for quick feedback
         pytest tests/test_datatypes.py -v --tb=short
         pytest tests/test_cross_platform.py -v -m "cross_platform" --tb=short
 
     - name: Test basic functionality
+      env:
+        PYHELIOS_DEV_MODE: 1
       run: |
         python -c "
         # Test basic PyHelios functionality