test(ui): explore provisional branch pause and reopen

components/reasoning-workspace.jsx

@@ -351,9 +351,14 @@ function BranchNotebookContent({
   openQuestions,
   lateResults,
   inactiveBranchNewResults,
+  doneForNowBranchIds,
+  onDoneForNow,
+  branchId,
 }) {
   const hasOpenItems = openQuestions && openQuestions.length > 0;
   const hasContributions = contributions && contributions.length > 0;
+  const isPaused = doneForNowBranchIds?.includes(branchId) || false;
+  const isBranchActive = !isPaused;
 
   return (
     <div className="space-y-6">
@@ -407,9 +412,35 @@ function BranchNotebookContent({
         <UpdatedConnectionCard update={lateResults[0]} />
       )}
 
-      {/* Quiet state — only when there are no open items and no updates */}
+      {/* Done for now control — only when branch is not already paused */}
+      {isBranchActive && onDoneForNow && contributions.length > 0 && (
+        <div className="flex justify-end pt-1">
+          <button
+            onClick={(e) => { e.stopPropagation(); onDoneForNow(); }}
+            style={{ cursor: "pointer" }}
+            className="rounded-lg border border-gray-300 bg-white px-4 py-2 text-sm font-medium text-gray-600 hover:bg-gray-50 transition whitespace-nowrap"
+          >
+            Done for now
+          </button>
+        </div>
+      )}
+
+      {/* Quiet state */}
       {!hasOpenItems && !lateResults?.length && (
-        <QuietStateCard />
+        <div className="rounded-lg border border-gray-200/60 bg-gray-50/40 px-5 py-5 text-center">
+          {isPaused ? (
+            <>
+              <p className="text-sm leading-relaxed text-gray-500 mb-1">
+                Nothing more to add here right now
+              </p>
+              <p className="text-xs leading-relaxed text-gray-400">
+                This branch is paused. Reasoning preserved — return when you have more information.
+              </p>
+            </>
+          ) : (
+            <QuietStateCard />
+          )}
+        </div>
       )}
     </div>
   );
@@ -805,6 +836,11 @@ export default function ReasoningWorkspace({
   branchLocalContributions,
   branchLocalLateResults,
   inactiveBranchNewResults,
+  activeBranchIdForNotebook,
+  // ── RTO.27B — provisional pause state ──
+  doneForNowBranchIds,
+  onDoneForNow,
+  onReopenBranch,
 }) {
   const [investigationHistory, setInvestigationHistory] = useState([]);
   const turnCounter = useRef(0);
@@ -1115,6 +1151,9 @@ export default function ReasoningWorkspace({
                     openQuestions={branchLocalQuestions || []}
                     lateResults={branchLocalLateResults || []}
                     inactiveBranchNewResults={inactiveBranchNewResults || {}}
+                    doneForNowBranchIds={doneForNowBranchIds || []}
+                    onDoneForNow={onDoneForNow}
+                    branchId={activeBranchIdForNotebook}
                   />
                 )}
 
@@ -1149,14 +1188,12 @@ export default function ReasoningWorkspace({
                     {genuineCompletion && (
                       <CompletionCard summary={resolveCurrentSummary(propUnderstanding || graph?.currentSummary || result?.updatedSituationGraph?.currentSummary)} />
                     )}
-                    {!genuineCompletion && (
-                      experimentalBranches && experimentalBranches.length > 0 ? (
-                        // In experiment mode: quiet facilitator state, not evidence limit verdict
-                        <QuietStateCard />
-                      ) : (
-                        <EvidenceLimitCard summary={resolveCurrentSummary(propUnderstanding || graph?.currentSummary || result?.updatedSituationGraph?.currentSummary)} />
-                      )
-                    )}
+                    {!genuineCompletion && experimentalBranches && experimentalBranches.length > 0 ? (
+                      // Quiet state is handled inside BranchNotebookContent for experiment mode
+                      null
+                    ) : !genuineCompletion ? (
+                      <EvidenceLimitCard summary={resolveCurrentSummary(propUnderstanding || graph?.currentSummary || result?.updatedSituationGraph?.currentSummary)} />
+                    ) : null}
                   </>
                 )}