code-to10 v6 A14 batch2: test E402/F401 cleanup plus touched-file residual E,F cleanup

(cherry picked from commit 1db02545f74c96b3b92be4fc32954659cec1f814)

Reconcile-conflict: A14b E402 imports referencing cloud.handler_core (does not exist here; core methods live in server.py) — kept HEAD imports with incoming's noqa: E402 markers, dropped the unused core_mod import (verified unused elsewhere in both files).

cloud/tests/test_coverage85_worker.py

@@ -11,7 +11,6 @@ import sqlite3
 import subprocess
 import sys
 import tempfile
-import time
 import unittest
 from pathlib import Path
 
@@ -506,7 +505,8 @@ class WorkerDbTestCase(unittest.TestCase):
 
         fake2 = Worker(self.db_path, "/fake/host.py",
                        env={"XCM_API_KEY": "x"},
-                       repos_runner=lambda cmd, timeout=None: (_ for _ in ()).throw(TypeError("one-arg only")) if False else two_arg(cmd, timeout))
+                       repos_runner=(lambda cmd, timeout=None: (_ for _ in ()).throw(TypeError("one-arg only"))
+                               if False else two_arg(cmd, timeout)))
         # 上面 fake2 的 runner 本身接受两参，直接验证两参路径。
         self.assertEqual(fake2._run_git(["git"]), ("two", None))