fix(ci): carry dual bridge intent through stable parameters

scripts/controller-pipeline-contract.test.mjs

@@ -46,5 +46,7 @@ test('coordinator defaults event bridge deployments to both non-production regio
   assert.match(pipeline, /\['BOTH', 'SELECT', 'CN', 'OVERSEAS'\]\.contains\(bridgeRegion\)/)
   assert.match(pipeline, /兼容旧 Jenkins 参数 SELECT：本次按 BOTH/)
   assert.match(pipeline, /事件桥 BOTH 仅支持开发或测试环境/)
-  assert.match(pipeline, /params\.EVENT_BRIDGE_REGION == 'BOTH' \? 'SELECT' : params\.EVENT_BRIDGE_REGION/)
+  assert.match(pipeline, /String downstreamImageTag = deployBothBridges[\s\S]*?\? "\$\{env\.IMAGE_TAG\}-both"/)
+  assert.match(pipeline, /String downstreamBridgeRegion = deployBothBridges[\s\S]*?\? 'CN'/)
+  assert.match(pipeline, /string\(name: 'EVENT_BRIDGE_REGION', value: downstreamBridgeRegion\)/)
 })

scripts/test-environment-pipeline-contract.test.mjs

@@ -163,4 +163,7 @@ test('one event bridge build deploys both regional instances in development and
   assert.match(pipeline, /bridgeRegions\.each \{ bridgeRegion ->/)
   assert.match(pipeline, /EVENT_BRIDGE_REGION_OVERRIDE=\$\{bridgeRegion\}/)
   assert.match(pipeline, /部署事件桥实例:/)
+  assert.match(pipeline, /imageTag\?\.endsWith\('-both'\)/)
+  assert.match(pipeline, /imageTag\.substring\(0, imageTag\.length\(\) - '-both'\.length\(\)\)/)
+  assert.match(pipeline, /env\.DEPLOY_BOTH_EVENT_BRIDGES = deployBothBridges \? 'true' : 'false'/)
 })