test(ui): explore branch notebook composition

components/scenario-form.jsx

@@ -226,7 +226,8 @@ export default function ScenarioForm() {
   /* ── RTO.25A — passive late-result branch switcher (experimental) ── */
 
   const [activeBranchId, setActiveBranchId] = useState("branch-b");
-  const [branchNewResults, setBranchNewResults] = useState({});
+  // Pre-seed Competitor development with a late result for RTO.27A testing
+  const [branchNewResults, setBranchNewResults] = useState({ "branch-a": true });
 
   /* ── RTO.26B — experimental branch-scoped reasoning fixture ───── */
 
@@ -262,6 +263,12 @@ export default function ScenarioForm() {
     return branchScoped.getBranchContributions(activeBranch.id);
   }, [activeBranch, branchScoped]);
 
+  // RTO.27A — late results for active branch
+  const experimentalBranchLateResults = useMemo(() => {
+    if (!activeBranch) return [];
+    return (branchScoped.getBranchLateResults?.(activeBranch.id) || []).map(lr => ({ text: lr.text }));
+  }, [activeBranch, branchScoped]);
+
   // Determine which non-active branches have new results for passive indicator
   const inactiveBranchNewResults = useMemo(() => {
     const result = {};
@@ -463,6 +470,7 @@ export default function ScenarioForm() {
                     experimentalBranches={BRANCHES.length > 0 ? BRANCHES : undefined}
                     branchLocalQuestions={experimentalBranchQuestions.length > 0 ? experimentalBranchQuestions : undefined}
                     branchLocalContributions={experimentalBranchContributions.length > 0 ? experimentalBranchContributions : undefined}
+                    branchLocalLateResults={experimentalBranchLateResults.length > 0 ? experimentalBranchLateResults : undefined}
                     inactiveBranchNewResults={Object.keys(inactiveBranchNewResults).length > 0 ? inactiveBranchNewResults : undefined}
                     onRestart={() => { setStatus("idle"); setResult(null); setScenario(""); }}
                   />
@@ -659,6 +667,7 @@ export default function ScenarioForm() {
                     experimentalBranches={BRANCHES.length > 0 ? BRANCHES : undefined}
                     branchLocalQuestions={experimentalBranchQuestions.length > 0 ? experimentalBranchQuestions : undefined}
                     branchLocalContributions={experimentalBranchContributions.length > 0 ? experimentalBranchContributions : undefined}
+                    branchLocalLateResults={experimentalBranchLateResults.length > 0 ? experimentalBranchLateResults : undefined}
                     inactiveBranchNewResults={Object.keys(inactiveBranchNewResults).length > 0 ? inactiveBranchNewResults : undefined}
                     onRestart={() => {
                   clearSession();