perf(ci): release coordinator builder executor

Jenkinsfile

@@ -36,7 +36,7 @@ def environmentChoicesForJob(String jobBaseName) {
 
 pipeline {
     // 总控流水线只识别变更并调度独立的服务 Job；实际 Maven、镜像和部署在 Jenkinsfile.service 中完成。
-    agent { label 'java-builder' }
+    agent none
 
     options {
         disableConcurrentBuilds()
@@ -69,6 +69,7 @@ pipeline {
 
     stages {
         stage('确定构建范围') {
+            agent { label 'java-builder' }
             steps {
                 script {
                     // 开发环境总控 Job 固定部署到 development，避免首次构建沿用 ENVIRONMENT 的默认 test 值。
@@ -151,6 +152,11 @@ pipeline {
                     }
                 }
             }
+            post {
+                always {
+                    cleanWs(deleteDirs: true, notFailBuild: true)
+                }
+            }
         }
 
         stage('生产环境部署确认（仅 production 执行）') {
@@ -170,6 +176,7 @@ pipeline {
                     expression { env.RESOLVED_ENVIRONMENT == 'test' && params.INITIALIZE_TEST_DATABASE }
                 }
             }
+            agent { label 'java-test' }
             steps {
                 sh 'sh deploy/scripts/initialize-test-databases.sh'
             }
@@ -225,7 +232,4 @@ pipeline {
         }
     }
 
-    post {
-        always { cleanWs(deleteDirs: true, notFailBuild: true) }
-    }
 }

scripts/controller-pipeline-contract.test.mjs

@@ -5,9 +5,12 @@ import test from 'node:test'
 const pipeline = (await readFile(new URL('../Jenkinsfile', import.meta.url), 'utf8'))
   .replaceAll('\r\n', '\n')
 
-test('coordinator runs only on the shared Java builder pool', () => {
+test('coordinator releases its builder while waiting for downstream jobs', () => {
+  assert.match(pipeline, /pipeline \{[\s\S]*?agent none/)
+  assert.match(pipeline, /stage\('确定构建范围'\) \{[\s\S]*?agent \{ label 'java-builder' \}/)
   assert.match(pipeline, /agent \{ label 'java-builder' \}/)
   assert.doesNotMatch(pipeline, /agent any/)
+  assert.doesNotMatch(pipeline, /post \{\s*always \{ cleanWs[\s\S]*?\}\s*\}\s*\}\s*$/)
 })
 
 test('AUTO detects database migrations without expanding them to all services', () => {