feat: add puzzle and big fish draft generation progress

packages/shared/src/contracts/puzzleAgentActions.ts

@@ -1,3 +1,5 @@
+import type { PuzzleAgentSessionSnapshot } from './puzzleAgentSession';
+
 export type PuzzleAgentSuggestedActionType =
   | 'request_summary'
   | 'compile_puzzle_draft'
@@ -54,6 +56,10 @@ export type PuzzleAgentActionRequest =
       themeTags?: string[];
     };
 
+/**
+ * 拼图操作接口直接返回最新会话，避免前端在选图等轻操作后再额外 GET 大体积快照。
+ */
 export interface PuzzleAgentActionResponse {
   operation: PuzzleAgentOperationRecord;
+  session: PuzzleAgentSessionSnapshot;
 }