fix: wait for workspace policy before creation

frontend/src/api/sessions.ts

@@ -1,6 +1,6 @@
 import { apiFetch } from "./client";
 import { getSettings } from "./settings";
-import { workspacePreferences, type WorkspacePreference } from "../workspaces/drafts";
+import { workspacePolicyGate, workspacePreferences, type WorkspacePreference } from "../workspaces/drafts";
 import type {
   Principal, ResumeSessionResult, SessionScope, SessionSummary, SessionDocument, UiResponse,
 } from "./types";
@@ -24,9 +24,11 @@ async function selectedPreferences(): Promise<WorkspacePreference> {
 
 export async function createSession(i: NewSessionInput) {
   const preferences = await selectedPreferences();
+  await workspacePolicyGate.waitFor(i.workspaceId ?? preferences.workspaceId);
+  const selection = workspacePreferences.load();
   return apiFetch<{ id: string }>("/sessions", {
     method: "POST",
-    body: JSON.stringify({ ...preferences, ...i }),
+    body: JSON.stringify({ ...selection, ...i }),
   });
 }