feat(forwarder): make checkpoint recovery idempotent

Preserve interrupted provider output, keep checkpoint projections deterministic, and enforce proto snapshot synchronization.

build/Taskfile.yml

@@ -29,9 +29,16 @@ tasks:
       - cp ./proto/from_extensions/aiserver_v1.proto ./proto/aiserver_v1.proto
       - perl -0pi -e 's|option go_package = "react-admin/cursor-server/gen/agent/v1;agentv1";|option go_package = "cursor/gen/agentv1;agentv1";|' ./proto/agent_v1.proto
       - perl -0pi -e 's|option go_package = "react-admin/cursor-server/gen/aiserver/v1;aiserverv1";|option go_package = "cursor/gen/aiserverv1;aiserverv1";|' ./proto/aiserver_v1.proto
+      - ./proto/check_proto_sync.sh
       - rm -rf ./gen/agentv1 ./gen/aiserverv1
       - task: generate:proto
 
+  check:proto:
+    summary: 检查根 proto 与扩展提取快照是否一致
+    dir: '{{.ROOT_DIR}}'
+    cmds:
+      - ./proto/check_proto_sync.sh
+
   generate:proto:
     summary: 生成 proto Go/Connect 代码
     dir: '{{.ROOT_DIR}}'