refactor: unify oper transaction dispatch

tests/fixtures/architecture/dependency-baseline.json

@@ -13,8 +13,8 @@
     "runtime_to_db": [],
     "workflow_to_db": []
   },
-  "edge_count": 6500,
-  "edge_sha256": "c27b649d471e40e8580426bdee28fdd927be03b7868a1b28bd8d9374c10be280",
+  "edge_count": 6499,
+  "edge_sha256": "f21eea0878e60d4b955a87da15cf0653eaecf07d147dc43e9eabc9f9573bb793",
   "edges": [
     "app -> app.runtime",
     "app -> app.runtime.compat",
@@ -3660,7 +3660,6 @@
     "app.db.oper.agenttask -> app.db.models",
     "app.db.oper.agenttask -> app.db.models.agenttask",
     "app.db.oper.agenttask -> app.db.models.agenttaskrun",
-    "app.db.oper.agenttask -> app.db.uow",
     "app.db.oper.downloadfailure -> app.db",
     "app.db.oper.downloadfailure -> app.db.base",
     "app.db.oper.downloadfailure -> app.db.models",

tests/test_architecture_dependencies.py

@@ -432,6 +432,23 @@ def test_database_internals_do_not_import_db_facades():
     assert violations == []
 
 
+def test_database_opers_use_dboper_transaction_dispatchers():
+    """Oper 不得绕过 DbOper 的统一 Session 类型分派直接调用事务 runner。"""
+    runner_names = {"run_sync_transaction", "run_async_transaction"}
+    violations: list[str] = []
+    for path in (APP_ROOT / "db" / "oper").rglob("*.py"):
+        tree = ast.parse(path.read_text(encoding="utf-8-sig"), filename=str(path))
+        for node in ast.walk(tree):
+            if not isinstance(node, ast.ImportFrom) or node.module != "app.db.uow":
+                continue
+            imported = {alias.name for alias in node.names} & runner_names
+            if imported:
+                relative = path.relative_to(PROJECT_ROOT).as_posix()
+                violations.append(f"{relative}:{node.lineno}:{','.join(sorted(imported))}")
+
+    assert violations == []
+
+
 def test_models_and_base_require_explicit_database_sessions():
     """Model/Base 不得装饰事务，且所有 db 参数必须由调用方显式传入。"""
     decorator_names = {

tests/test_db_plugin_message_agent_queries.py

@@ -366,7 +366,8 @@ def test_agenttask_oper_reads_with_explicit_session(db, monkeypatch):
     task_id = AgentTask.add_task(db.session, **_task("canonical", user_id="alice"))
 
     monkeypatch.setattr(
-        "app.db.oper.agenttask.run_sync_transaction",
+        db_base,
+        "run_sync_transaction",
         lambda _query: pytest.fail("显式 Session 查询不应创建兼容事务"),
     )