feat(history): full conversation trajectory — GetCascadeTrajectory RPC, all step types rendered

server/bridge-client.js

@@ -46,6 +46,16 @@ class BridgeClient {
         return this._get('/api/cascades');
     }
 
+    /**
+     * 개별 대화의 전체 스텝/메시지 (GetCascadeTrajectory RPC)
+     */
+    async getTrajectory(cascadeId) {
+        return this._post('/api/ls/rpc', {
+            method: 'GetCascadeTrajectory',
+            payload: { cascadeId },
+        });
+    }
+
     /**
      * 메시지 전송
      */