Allow shared evidence and bounded causal diagnosis with retry feedback

tests/test_trial.py

@@ -28,7 +28,7 @@ class PipelineAdapter:
     async def generate(self, config, request, **kwargs):
         self.calls += 1
         phase = {"case_interpretation_v1": "case", "hypotheses_v1": "hypotheses", "hypotheses_v2": "hypotheses",
-                 "investigation_v1": "loop", "investigation_v2": "loop", "diagnosis_v1": "diagnosis",
+                 "investigation_v1": "loop", "investigation_v2": "loop", "investigation_v3": "loop", "diagnosis_v1": "diagnosis", "diagnosis_v2": "diagnosis",
                  "change_request_v1": "request"}[request["prompt_version"]]
         adapter = self.adapters[phase]
         return await adapter.generate(config, request, **kwargs)