Extract Implementer clarification into handoff guidance

tests/test_packages.py

@@ -12,6 +12,14 @@ ROOT = Path(__file__).resolve().parents[1]
 
 
 class PackageTests(unittest.TestCase):
+    def test_handoff_clarification_method(self):
+        package = ROOT / "packages/implementer-handoff"
+        check_package(package)
+        text = (package / "handoff.md").read_text()
+        self.assertIn("blocked after reasonable investigation", text)
+        self.assertIn("scope changes require owner authority", text)
+        self.assertNotIn("Trace load order", text)
+
     def test_schema_two_claim_policy_bounds(self):
         with tempfile.TemporaryDirectory() as directory:
             package = Path(directory) / "planner-scope"