(test): include Server and TCP adapter in coverage instrumentation

Integration tests run with Swoole and exercise adapter/server
construction and routing paths. Let pcov instrument them so the
coverage numbers reflect what the test suite actually exercises.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: abnegate

phpunit.xml

@@ -14,9 +14,7 @@
             <directory>src</directory>
         </include>
         <exclude>
-            <directory>src/Server</directory>
             <directory>src/Sockmap</directory>
-            <file>src/Adapter/TCP.php</file>
         </exclude>
     </source>
 </phpunit>