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_v2cov_wait_ops.py

@@ -15,7 +15,7 @@ from unittest import mock
 REPO_ROOT = Path(__file__).resolve().parents[2]
 sys.path.insert(0, str(REPO_ROOT))
 
-from cloud.wait_ops import (
+from cloud.wait_ops import (  # noqa: E402
     _normalize_json_checks,
     _row_dict,
     build_pr_diagnostics,
@@ -189,10 +189,11 @@ class WaitCoresTestCase(unittest.TestCase):
         self.assertEqual((task_id, kind), ("t1", "needs_continue"))
 
     def test_poll_first_bad_timeout_immediate(self):
-        fetch = lambda: {"t1": {"status": "completed",
-                                "pending_approvals": 0,
-                                "pending_input": 0,
-                                "pending_followups": 0}}
+        def fetch():
+            return {"t1": {"status": "completed",
+                         "pending_approvals": 0,
+                         "pending_input": 0,
+                         "pending_followups": 0}}
         changed, summaries, waited, timed_out = poll_for_first_change(
             fetch, ["t1"], timeout_seconds="bad")
         self.assertEqual(changed["kind"], "terminal")
@@ -204,7 +205,8 @@ class WaitCoresTestCase(unittest.TestCase):
                {"t1": {"status": "completed", "pending_approvals": 0,
                        "pending_input": 0, "pending_followups": 0}}]
         it = iter(seq)
-        fetch = lambda: next(it, seq[-1])
+        def fetch():
+            return next(it, seq[-1])
         changed, summaries, waited, timed_out = poll_for_first_change(
             fetch, ["t1"], timeout_seconds=5, poll_seconds=0.01)
         self.assertEqual(changed["kind"], "terminal")