feat: integrate Pi backend and Pi Web

pi-web/lib/agent-client.ts

@@ -0,0 +1,28 @@
+// Client-side helper for POST /api/agent/[id].
+//
+// Every /api/agent/[id] route returns one of:
+//   { success: true, data: <result> }
+//   { error: string }              (non-2xx)
+//
+// Call sites previously repeated the same 5-line fetch block 13× in
+// hooks/useAgentSession.ts. This helper collapses that down to one line.
+
+export async function sendAgentCommand<T = unknown>(
+  sessionId: string,
+  command: Record<string, unknown>,
+): Promise<T> {
+  const res = await fetch(`/api/agent/${encodeURIComponent(sessionId)}`, {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify(command),
+  });
+  const body = (await res.json().catch(() => ({}))) as {
+    success?: boolean;
+    data?: T;
+    error?: string;
+  };
+  if (!res.ok || body.error) {
+    throw new Error(body.error ?? `HTTP ${res.status}`);
+  }
+  return body.data as T;
+}