test(tests): update suite for sync‑twenty migration and drop obsolete gmail/notion sync tests

tests/test_outcome_followup.py

@@ -64,14 +64,6 @@ class OutcomeFollowupBranchSpec(unittest.TestCase):
             "spec lost the cap that stops the follow-up branch from nagging indefinitely",
         )
 
-    def test_threshold_contrast_with_gmail_sync_documented(self):
-        text = COMMAND.read_text(encoding="utf-8")
-        self.assertIn(
-            "30-day staleness flag",
-            text,
-            "spec lost the rationale for the 10-day nudge vs /gmail-sync's 30-day alarm",
-        )
-
     @unittest.skipUnless(
         _HAVE_YAML,
         "PyYAML not installed (the CI Python-test job omits it; the lint job runs lint_skills.py directly)",