fix: use .phpcs.xml.dist config in CI instead of inline flags

The CI was overriding the project PHPCS config by passing
--standard=WordPress-Core directly. Now uses the project
.phpcs.xml.dist which includes exclusions for standard WP
patterns (class in functions.php).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/deploy.yml

@@ -25,13 +25,7 @@ jobs:
 
       - name: Run PHPCS (WordPress Core)
         run: |
-          ~/.composer/vendor/bin/phpcs \
-            --standard=WordPress-Core \
-            --extensions=php \
-            --ignore=vendor/,node_modules/,tests/ \
-            --warning-severity=0 \
-            -s \
-            .
+          ~/.composer/vendor/bin/phpcs -s .
 
       - name: JS Syntax Check
         run: |