fix(writer): await async InferenceEngine.chat_structured in WriterAgent

src/genesis/writer/writer_agent.py

@@ -5,6 +5,8 @@
 """
 from __future__ import annotations
 
+import asyncio
+
 from genesis.inference.engine import InferenceEngine
 from genesis.inference.prompt_registry import PromptRegistry
 from genesis.inference.types import Prompt, StructuredResult
@@ -84,13 +86,17 @@ class WriterAgent:
 
     def _call_llm(self, context: GenerationContext) -> dict:
         prompt = self._resolve_prompt()
-        result: StructuredResult = self.engine.chat_structured(
+        result = self.engine.chat_structured(
             session_id=self.session_id,
             prompt=prompt,
             variables=context.to_vars(),
             schema=CHAPTER_OUTPUT_SCHEMA,
             retry_count=2,
         )
+        # 真实 InferenceEngine.chat_structured 为 async；测试用同步 FakeEngine 返回普通对象。
+        # 兼容两者：若返回协程则通过 asyncio.run 驱动（调用方 orchestrator/qa_loop/脚本均为同步上下文）。
+        if asyncio.iscoroutine(result):
+            result = asyncio.run(result)
         if result.status not in ("ok", "fallback"):
             raise WriterGenerationError(f"引擎返回异常状态: {result.status}")
         return result.data