fix: make workspace policy waits selection-safe

frontend/src/shell/SteerInput.tsx

@@ -84,8 +84,7 @@ export function SteerInput({
     setLastUserEntry({ kind: "input", text: trimmed });
     onSessionCreating?.(trimmed);
     try {
-      await workspacePolicyGate.waitFor(workspacePreferences.load().workspaceId);
-      const { id } = await createSession({ question: trimmed, ...workspacePreferences.load() });
+      const { id } = await createSession({ question: trimmed });
       onSessionCreated?.(id);
       setText("");
     } catch (error) {
@@ -190,6 +189,11 @@ export function ComposerFooter() {
     ? models.filter((candidate) => allowedModels.includes(`${candidate.provider}/${candidate.id}`))
     : models;
 
+  useEffect(() => {
+    if (selectedWorkspace?.revision) workspacePolicyGate.select(workspace);
+    else workspacePolicyGate.clear();
+  }, [selectedWorkspace, workspace]);
+
   useEffect(() => {
     if (!allowedModels?.length) return;
     const selected = preferences.provider && preferences.model
@@ -222,7 +226,7 @@ export function ComposerFooter() {
       patch.workspaceId
       && patch.workspaceId !== workspace
       && workspaces.some((candidate) => candidate.id === patch.workspaceId && candidate.revision)
-    ) workspacePolicyGate.begin(patch.workspaceId);
+    ) workspacePolicyGate.select(patch.workspaceId);
     const next = workspacePreferences.save({ ...preferences, ...patch });
     setPreferences(next);
   }