fix: remove post cleanup block

K8s pod is ephemeral — workspace dies with pod. deleteDir/cleanWs
not needed and fails on node_modules permission errors.

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

Jenkinsfile

@@ -112,15 +112,4 @@ spec:
         }
     }
 
-    post {
-        always {
-            deleteDir()
-        }
-        success {
-            echo "Build ${BUILD_NUMBER} deployed. Image: ${IMAGE}:${BUILD_NUMBER}"
-        }
-        failure {
-            echo "Build ${BUILD_NUMBER} failed."
-        }
-    }
 }