feat(08-02): add Generalist agent creation to onboarding wizard

- Third agentsApi.create() call with role: "general", name: "Generalist"
- metadata: { pendingSkillGroups: ["Creative"] } records Phase 11 intent
- Updated description text: mentions all 3 agents (PM, engineer, generalist)
- Placed BEFORE queryClient.invalidateQueries for clean ordering

ui/src/components/NexusOnboardingWizard.tsx

@@ -108,6 +108,16 @@ export function OnboardingWizard() {
         runtimeConfig,
       });
 
+      // Step 4: Create Generalist agent (non-code work: copy, research, docs)
+      await agentsApi.create(company.id, {
+        name: "Generalist",
+        role: "general",
+        adapterType: "claude_local",
+        adapterConfig,
+        runtimeConfig,
+        metadata: { pendingSkillGroups: ["Creative"] },
+      });
+
       queryClient.invalidateQueries({
         queryKey: queryKeys.agents.list(company.id),
       });
@@ -145,7 +155,7 @@ export function OnboardingWizard() {
             </h1>
             <p className="text-sm text-muted-foreground">
               Choose a project root directory. {VOCAB.appName} will set up a{" "}
-              {VOCAB.ceo.toLowerCase()} and engineer to start working.
+              {VOCAB.ceo.toLowerCase()}, engineer, and generalist to start working.
             </p>
           </div>