ci: exclude Wylab override files from build-test-debug

Same approach as yaml-linter - delete _Wylab override files before
testing to avoid "Duplicate ID" prototype errors.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.github/workflows/build-test-debug.yml

@@ -23,6 +23,12 @@ jobs:
     - name: Checkout Master
       uses: actions/checkout@v4.2.2
 
+    - name: Delete Wylab override files (duplicates upstream for customization)
+      run: |
+        rm -f Resources/Prototypes/_Wylab/GameRules/events.yml
+        rm -f Resources/Prototypes/_Wylab/GameRules/pests.yml
+        rm -f Resources/Prototypes/_Wylab/GameRules/subgamemodes.yml
+
     - name: Setup Submodule
       run: |
         git submodule update --init --recursive