Prioritize investigation hypotheses by confidence after bootstrap

tests/test_investigator.py

@@ -270,3 +270,27 @@ def test_provider_configuration_error_blocks_without_abandoning_hypotheses(tool_
 @pytest.mark.parametrize("name",["investigation-output","investigation-state","investigation-context"])
 def test_loop_schemas_valid(name):
     Draft202012Validator.check_schema(json.loads(files("viano_bug_analysis.schemas").joinpath(name+'-v1.schema.json').read_text()))
+
+
+def test_confidence_scheduler_keeps_growing_candidate_then_switches_after_weakening(tool_case):
+    def change(reply,context):
+        hid=context['selected_hypothesis']
+        turns=sum(c['selected_hypothesis']==hid for c in adapter.contexts)
+        if hid=='H1' and turns in (2,3):
+            reply['update']['confidence']='supported' if turns==2 else 'weakened'
+            reply['next']={'kind':'tool','operation':'source.read_context',
+                'arguments':{'source_ref':'tool/code.cpp','start_line':1,'end_line':2}}
+    adapter=LoopAdapter(change)
+    loop=Investigator(tool_case[0],gateway(adapter))
+    first=run(loop,steps=4)
+    assert first.status=='YIELDED'
+    assert [c['selected_hypothesis'] for c in adapter.contexts]==['H1','H2','H3','H1']
+    # Resume the persisted confidence state; neither cursor nor a restart forces rotation.
+    result=run(Investigator(tool_case[0],gateway(adapter)),steps=2)
+    assert [c['selected_hypothesis'] for c in adapter.contexts]==['H1','H2','H3','H1','H1','H2']
+    saved=state(result)
+    assert saved['hypotheses']['H1']['confidence']=='weakened'
+    assert saved['hypotheses']['H1']['disposition']=='active'
+    account=BudgetManager(tool_case[0]).snapshot(*CASE).state['accounts']['H1']
+    assert account['remaining']>0 and account['status']=='investigating'
+    assert PackageValidator().validate(result.package).valid