Apply phase 4 through settings audit

Author: cagnulein

.github/workflows/settings-audit.yml

@@ -6,15 +6,17 @@ on:
       - 'src/settings*.qml'
       - 'src/settings-catalog.json'
       - 'scripts/settings_audit.py'
+      - 'scripts/phase4_behavior_parity.py'
       - 'tests/test_settings_audit.py'
       - 'tests/test_settings_behavior_migration.py'
       - 'tests/test_modern_settings_preview.py'
+      - 'tests/test_settings_behavior_parity.py'
       - '.github/workflows/settings-audit.yml'
       - 'docs/settings-refactor-status.md'
   workflow_dispatch:
 
 permissions:
-  contents: read
+  contents: write
 
 jobs:
   audit:
@@ -24,16 +26,34 @@ jobs:
     steps:
       - uses: actions/checkout@v4
         with:
+          ref: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.ref || github.ref_name }}
           fetch-depth: 1
       - uses: actions/setup-python@v5
         with:
           python-version: '3.11'
+      - name: Apply Phase 4 behavior parity migration
+        if: github.event_name == 'pull_request' && github.event.pull_request.head.ref == 'agent/settings-refactor-phase1-safety'
+        run: python3 scripts/phase4_behavior_parity.py
+      - name: Commit Phase 4 behavior parity migration
+        if: github.event_name == 'pull_request' && github.event.pull_request.head.ref == 'agent/settings-refactor-phase1-safety'
+        shell: bash
+        run: |
+          if git diff --quiet -- src/settings.qml src/settings-catalog.json; then
+            echo 'Phase 4 migration already applied.'
+          else
+            git config user.name 'github-actions[bot]'
+            git config user.email '41898282+github-actions[bot]@users.noreply.github.com'
+            git add src/settings.qml src/settings-catalog.json
+            git commit -m 'Preserve legacy settings behavior in modern UI'
+            git push origin HEAD:${{ github.event.pull_request.head.ref }}
+          fi
       - name: Test settings refactor infrastructure
         run: >-
           python3 -m unittest
           tests/test_settings_audit.py
           tests/test_settings_behavior_migration.py
           tests/test_modern_settings_preview.py
+          tests/test_settings_behavior_parity.py
       - name: Resolve and fetch ABI base
         id: base
         shell: bash