refactor: unify protected task completion

app/application/plugin/install.py

@@ -9,6 +9,7 @@ from typing import Any, ContextManager, Optional
 
 from app.schemas.exception import PersistenceUnavailableError
 from app.application.plugin.lifecycle import plugin_lifecycle
+from app.runtime.execution import await_task_to_terminal
 from app.runtime.log import logger
 from app.schemas.exception import PluginMutationRejectedError
 
@@ -29,17 +30,6 @@ PluginRegistrationRefresher = Callable[[str], Awaitable[object]]
 PluginMutationAdmission = Callable[[str], ContextManager[None]]
 PluginPackageWriteGuard = Callable[[str], ContextManager[None]]
 
-
-async def _await_task_to_terminal(task: asyncio.Task[Any]) -> Any:
-    """忽略调用方的重复取消，直到受保护子任务进入真实终态。"""
-    while not task.done():
-        try:
-            return await asyncio.shield(task)
-        except asyncio.CancelledError:
-            continue
-    return task.result()
-
-
 @dataclass(frozen=True, slots=True)
 class PluginInstallRollback:
     """描述失败安装中各类可补偿副作用的恢复结果。"""
@@ -193,7 +183,7 @@ class PluginInstallCommand:
             state.checkpoint = checkpoint
         except asyncio.CancelledError:
             try:
-                state.checkpoint = await _await_task_to_terminal(checkpoint_task)
+                state.checkpoint = await await_task_to_terminal(checkpoint_task)
             except BaseException:
                 pass
             raise
@@ -369,7 +359,7 @@ class PluginInstallCommand:
             )
         )
         try:
-            result = await _await_task_to_terminal(rollback_task)
+            result = await await_task_to_terminal(rollback_task)
         except BaseException as err:
             logger.error(f"插件 {plugin_id} 取消后的补偿失败：{err}")
             return
@@ -410,12 +400,7 @@ class PluginInstallCommand:
             cleanup_task = asyncio.create_task(
                 self._restore_refreshed_runtime(plugin_id)
             )
-            while not cleanup_task.done():
-                try:
-                    await asyncio.shield(cleanup_task)
-                except asyncio.CancelledError:
-                    continue
-            rollback = await cleanup_task
+            rollback = await await_task_to_terminal(cleanup_task)
             state.refresh_compensated = True
             if rollback.errors:
                 logger.error(