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 \
+          ~/.composer/vendor/bin/phpcs -s .
-            --standard=WordPress-Core \
-            --extensions=php \
-            --ignore=vendor/,node_modules/,tests/ \
-            --warning-severity=0 \
-            -s \
-            .
 
       - name: JS Syntax Check
         run: |

.phpcs.xml.dist

@@ -5,6 +5,12 @@
 	<!-- Scan these files -->
 	<file>.</file>
 
+	<!-- Only check PHP files -->
+	<arg name="extensions" value="php"/>
+
+	<!-- Only report errors, not warnings -->
+	<arg name="warning-severity" value="0"/>
+
 	<!-- Exclude third-party and dev-only directories -->
 	<exclude-pattern>/vendor/*</exclude-pattern>
 	<exclude-pattern>/node_modules/*</exclude-pattern>