feat(integrations/langgraph-python): dormant env-gated Intelligence runtime wiring

When COPILOTKIT_LICENSE_TOKEN is set, wire CopilotKitIntelligence + identifyUser +
licenseToken (marker-fenced for opt-out); otherwise InMemoryAgentRunner — today's
behavior, unchanged. Document the optional Intelligence env keys (commented) in
.env.example. No visible change to the example until a license is provided.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: BenTaylorDev

examples/integrations/langgraph-python/.env.example

@@ -1,2 +1,8 @@
 AGENT_URL=http://localhost:8123
-OPENAI_API_KEY=
+OPENAI_API_KEY=
+
+# --- CopilotKit Intelligence (optional; set COPILOTKIT_LICENSE_TOKEN to enable) ---
+# COPILOTKIT_LICENSE_TOKEN=
+# INTELLIGENCE_API_URL=http://localhost:4201
+# INTELLIGENCE_GATEWAY_WS_URL=ws://localhost:4401
+# INTELLIGENCE_API_KEY=   # local dev: see examples/integrations/_intelligence/.env.intelligence for the seed value

examples/integrations/langgraph-python/src/app/api/copilotkit/[[...slug]]/route.ts

@@ -1,5 +1,6 @@
 import {
   CopilotRuntime,
+  CopilotKitIntelligence,
   createCopilotEndpoint,
   InMemoryAgentRunner,
 } from "@copilotkit/runtime/v2";
@@ -17,7 +18,22 @@ const defaultAgent = new LangGraphAgent({
 
 const runtime = new CopilotRuntime({
   agents: { default: defaultAgent },
-  runner: new InMemoryAgentRunner(),
+  // --- copilotkit:intelligence (remove this block to opt out) ---
+  ...(process.env.COPILOTKIT_LICENSE_TOKEN
+    ? {
+        intelligence: new CopilotKitIntelligence({
+          apiKey: process.env.INTELLIGENCE_API_KEY ?? "",
+          apiUrl: process.env.INTELLIGENCE_API_URL ?? "http://localhost:4201",
+          wsUrl:
+            process.env.INTELLIGENCE_GATEWAY_WS_URL ?? "ws://localhost:4401",
+        }),
+        // Demo stub — replace with your real auth-derived user identity before any
+        // multi-user deployment, or all users share one thread history.
+        identifyUser: () => ({ id: "demo-user", name: "Demo User" }),
+        licenseToken: process.env.COPILOTKIT_LICENSE_TOKEN,
+      }
+    : { runner: new InMemoryAgentRunner() }),
+  // --- /copilotkit:intelligence ---
   openGenerativeUI: true,
   a2ui: {
     injectA2UITool: false,