Compact final diagnosis context and allow reviewed remediation data

tests/test_compact_handoff.py

@@ -65,7 +65,7 @@ def test_retry_gets_actionable_feedback_and_portable_replay(diagnosed, tmp_path,
     class Correcting(RequestAdapter):
         async def generate(self, config, request, **kwargs):
             response = await super().generate(config, request, **kwargs)
-            assert request['prompt_version'] == (first_version if self.calls == 1 else 'change_request_v3')
+            assert request['prompt_version'] == (first_version if self.calls == 1 else 'change_request_v4')
             if self.calls == 1:
                 response.document['affected_scope'][0]['source_ref'] = 'wrong.cpp'
             else: