feat(v2): T6 CollaborativePipeline 编排（快路径/协作循环/熔断/终审）

router_system/worker.py

@@ -68,6 +68,12 @@ class WorkerLoop:
         self.max_fix_attempts = max_fix_attempts
         self.model_used = model_used
 
+    async def direct_answer(self, query: str) -> str:
+        """快路径直答：让 Worker 直接生成用户回答（非 JSON、无围栏）。"""
+        prompt = ("请直接回答下面这个问题，输出对用户有用的正文"
+                  "（不要输出 JSON，不要加代码块围栏）。问题：" + query)
+        return await self.generate(prompt)
+
     def _domain_from(self, ws: Workspace) -> str:
         tags = (ws.get("brief") or {}).get("tags") or []
         for t in tags:
@@ -76,8 +82,8 @@ class WorkerLoop:
         return "general"
 
     async def run_step(self, ws: Workspace, step_id: str,
-                       existing_artifact: str = "") -> StepOutcome:
-        """执行单个 step。existing_artifact 为该步当前已有工件全文（若有）。"""
+                       existing_artifact: str = "", hint: str = "") -> StepOutcome:
+        """执行单个 step。existing_artifact 为该步当前已有工件全文；hint 为 Architect 裁决提示。"""
         domain = self._domain_from(ws)
         brief = ws.get("brief") or {}
         plan = brief.get("plan") or []
@@ -89,7 +95,7 @@ class WorkerLoop:
         details: List[str] = []
 
         for attempt in range(1, self.max_fix_attempts + 1):
-            prompt = self._build_prompt(ws, step_id, current, attempt, done_criteria)
+            prompt = self._build_prompt(ws, step_id, current, attempt, done_criteria, hint)
             out = await self.generate(prompt)
             if domain == "code":
                 candidate = extract_code_block(out)
@@ -134,13 +140,15 @@ class WorkerLoop:
         )
 
     def _build_prompt(self, ws: Workspace, step_id: str, current: str,
-                      attempt: int, done_criteria: str) -> str:
+                      attempt: int, done_criteria: str, hint: str = "") -> str:
         base = ws.render_for_worker(step_id, artifact_text=current or None)
         if attempt > 1:
             base += (
                 "\n\n[注意] 上次生成的工件未通过接地验证。请修正以下问题后重新输出"
                 f"完整工件。本次为第 {attempt} 次尝试。"
             )
+        if hint:
+            base += "\n\n[架构师裁决] " + hint
         return base