feat: integrate Pi backend and Pi Web

pi/packages/coding-agent/examples/sdk/13-session-runtime.ts

@@ -0,0 +1,67 @@
+/**
+ * Session runtime
+ *
+ * Use AgentSessionRuntime when you need to replace the active AgentSession,
+ * for example for new-session, resume, fork, or import flows.
+ *
+ * The important pattern is: after the runtime replaces the active session,
+ * rebind any session-local subscriptions and extension bindings to `runtime.session`.
+ */
+
+import {
+	type CreateAgentSessionRuntimeFactory,
+	createAgentSessionFromServices,
+	createAgentSessionRuntime,
+	createAgentSessionServices,
+	getAgentDir,
+	SessionManager,
+} from "@earendil-works/pi-coding-agent";
+
+const createRuntime: CreateAgentSessionRuntimeFactory = async ({ cwd, sessionManager, sessionStartEvent }) => {
+	const services = await createAgentSessionServices({ cwd });
+	return {
+		...(await createAgentSessionFromServices({
+			services,
+			sessionManager,
+			sessionStartEvent,
+		})),
+		services,
+		diagnostics: services.diagnostics,
+	};
+};
+const runtime = await createAgentSessionRuntime(createRuntime, {
+	cwd: process.cwd(),
+	agentDir: getAgentDir(),
+	sessionManager: SessionManager.create(process.cwd()),
+});
+
+let unsubscribe: (() => void) | undefined;
+
+async function bindSession() {
+	unsubscribe?.();
+	const session = runtime.session;
+	await session.bindExtensions({});
+	unsubscribe = session.subscribe((event) => {
+		if (event.type === "queue_update") {
+			console.log("Queued:", event.steering.length + event.followUp.length);
+		}
+	});
+	return session;
+}
+
+let session = await bindSession();
+const originalSessionFile = session.sessionFile;
+console.log("Initial session:", originalSessionFile);
+
+await runtime.newSession();
+session = await bindSession();
+console.log("After newSession():", session.sessionFile);
+
+if (originalSessionFile) {
+	await runtime.switchSession(originalSessionFile);
+	session = await bindSession();
+	console.log("After switchSession():", session.sessionFile);
+}
+
+unsubscribe?.();
+await runtime.dispose();