Use compact investigation working sets with durable local evidence recall

tests/test_lean_investigation_decision.py

@@ -202,6 +202,8 @@ def test_v14_positive_early_review_reaches_independent_diagnosis_with_rest_budge
             reply['next']={'kind':'request_diagnosis','reason':'Scoped defect with countercheck.','countercheck_refs':[other]}
         else:reply['next']={'kind':'tool','operation':'project.query','arguments':rows()}
     loop=Investigator(tool_case[0],gateway(LoopAdapter(change)),router=InvestigationToolRouter(project_research=service))
+    original=loop._context
+    loop._context=lambda *args:dict(original(*args),prompt_version='investigation_project_v14')
     done=run(loop,steps=10)
     assert done.status=='COMPLETED' and state(done)['early_stop']['status']=='requested'
     budget=BudgetManager(tool_case[0]).snapshot(*CASE).state