fix(extension): 执行器守卫与注入修复——active_store 不存在+占位误判已注入适配器

验收实测:176 启动日志『has no attribute active_store』(注入
跳过),且占位守卫按 type is ExtensionExecutor 判断——TL 接线的
适配器正是该类,已注入也会被误判 503。修复:注入走 get_store();
守卫改判 _real is None(真正未注入)。

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

bioflow_service/app/context.py

@@ -168,7 +168,7 @@ async def init_context(db_path: str | None = None) -> Context:
         from .services.bioflow.extension_exec import ExtensionExecConfig, ExtensionExecutor as RealExecutor
         cfg = ExtensionExecConfig()
         real = RealExecutor(cfg)
-        store = ext_mod.active_store()
+        store = ext_mod.get_store()
         if store is not None:
             ext_mod.inject_real_executor(real, store)
             logger.info("extension executor wired (image suffix=%s)", cfg.docker_tag_suffix)

bioflow_service/app/services/bioflow/extensions.py

@@ -525,8 +525,10 @@ class ExtensionStore:
         ))
 
         executor = self.executor or ExtensionExecutor()
-        if isinstance(executor, ExtensionExecutor) and type(executor) is ExtensionExecutor:
-            # 占位执行器（Dev-B 未接入）：明确 503 语义，绝不伪装成 trial_failed 触发修复循环
+        if isinstance(executor, ExtensionExecutor) and executor._real is None:
+            # 占位执行器（未注入真实执行器）：明确 503 语义，
+            # 绝不伪装成 trial_failed 触发修复循环。
+            # 注意:TL 接线后的适配器也是 ExtensionExecutor 实例,但 _real 已注入。
             raise ExtensionRunError(
                 "扩展执行器未接入（extension_exec.py 由 Dev-B 实现；"
                 "接口签名见 extensions.ExtensionExecutor）"