feat(ui): RTO.31 ownership of focused contributions flows to scenario form

- Add focusedContributions state + appendFocusedContribution callback in ScenarioForm
- Contributions persist through session lifecycle (save/restore/restart)
- Pass onFocusedContribution and focusedContributions to ReasoningWorkspace
- Call onFocusedContribution on successful deconstruct with full result shape
- Test: contribution sequence, field preservation, same/different target coexistence

components/reasoning-workspace.jsx

@@ -840,6 +840,8 @@ export default function ReasoningWorkspace({
   onAnswerSubmit,
   lastSubmittedAnswer,
   onRestart,
+  focusedContributions,
+  onFocusedContribution,
 }) {
   const [investigationHistory, setInvestigationHistory] = useState([]);
   const turnCounter = useRef(0);
@@ -869,9 +871,10 @@ export default function ReasoningWorkspace({
         selectedQuestion: result.selectedQuestion,
         summary: result.summary || propUnderstanding,
         updatedAt: new Date().toISOString(),
+        focusedContributions,
       });
     }
-  }, [updateStatus, result]);
+  }, [updateStatus, result, focusedContributions]);
 
   // Capture the current selected question at submit time (not from a stale ref)
   const capturePendingTurn = (selectedQuestion, answerText) => {
@@ -1049,6 +1052,20 @@ export default function ReasoningWorkspace({
 
       if (!data.success) throw new Error(data.error || "Deconstruction failed");
 
+      // Persist contribution to case-level owner (ScenarioForm)
+      onFocusedContribution?.({
+        targetNodeId,
+        targetLabel: targetNode?.label || "",
+        targetDescription: targetNode?.description || "",
+        question: focused.question,
+        answer: answerText,
+        observations: data.observations,
+        uncertainties: data.uncertainties,
+        assumptions: data.assumptions,
+        relationships: data.relationships,
+        possibleFollowUpQuestions: data.possibleFollowUpQuestions,
+      });
+
       setProcessingStep("idle");
       setFocusedInvestigations((prev) => ({
         ...prev,