Simplify investigation replies and derive controller bookkeeping

tests/test_confidence_review.py

@@ -105,6 +105,8 @@ def test_invalid_review_is_atomic_before_assessment_or_tool_spending(tool_case):
         if context['previous_result']:
             reply['update']['causal_review']=review(against=['E999999'])
     loop=Investigator(store,gateway(LoopAdapter(change)),router=InvestigationToolRouter(project_research=service))
+    original=loop._context
+    loop._context=lambda *args:dict(original(*args),prompt_version='investigation_project_v13')
     run(loop,steps=3)
     before=BudgetManager(store).snapshot(*CASE).state
     result=asyncio.run(loop.step(*CASE))