Persist cumulative investigation briefs and trim live bookkeeping

tests/test_investigator.py

@@ -45,9 +45,23 @@ class LoopAdapter:
             result["next"]={"kind":"test","executor":"human","question":"What occurs after interaction?","steps":["Interact once"],
                             "prerequisites":["Use the specified build"],"requested_observations":["Record the observed state"],"environment":"build-A"}
         if self.change:self.change(result,context)
-        if request['prompt_version']=='investigation_project_v12':
+        if request['prompt_version'] in {'investigation_project_v12','investigation_project_v13'}:
             result['update'].setdefault('causal_review',{'effect':'neutral','support':[],'against':[],
                 'reason':'This fixture gathers context without establishing a causal defect.'})
+        if request['prompt_version']=='investigation_project_v13':
+            existing=context.get('working_brief')
+            review=result['update']['causal_review']
+            findings=[]
+            for direction in ('support','against'):
+                refs=review[direction]
+                if refs:findings.append({'id':'B0001' if direction=='support' else 'B0002',
+                    'direction':direction,'text':'Fixture scoped finding','scope':'Fixture snapshot', 'evidence_refs':refs})
+            old={f['id']:f for f in existing['findings']} if existing else {}
+            new={f['id']:f for f in findings}
+            result['update'].setdefault('working_brief',{'format_version':1,'findings':findings,
+                'uncertainties':['Causal defect not established.'],'next_question':'Check the selected mechanism.',
+                'changes':[{'id':fid,'reason':'Fixture revises the finding.',
+                    'evidence_refs':result['update']['evidence_refs']} for fid,f in old.items() if new.get(fid)!=f]})
         return ProviderResponse(result,"fixture-investigation",100,50)