Add Agent Computer provider

Add an Agent Computer provider to the TypeScript SDK, wire in provider-specific inspector URLs, and document the new deploy flow with an example package.

Co-authored-by: Codex <noreply@openai.com>

examples/agentcomputer/src/index.ts

@@ -0,0 +1,19 @@
+import { SandboxAgent } from "sandbox-agent";
+import { agentcomputer } from "sandbox-agent/agentcomputer";
+
+const client = await SandboxAgent.start({
+  sandbox: agentcomputer(),
+});
+
+console.log(`UI: ${client.inspectorUrl}`);
+
+const health = await client.getHealth();
+console.log(`Health: ${health.status}`);
+
+const agents = await client.listAgents();
+console.log("Agents:", agents.agents.map((agent) => agent.id).join(", "));
+
+process.once("SIGINT", async () => {
+  await client.destroySandbox();
+  process.exit(0);
+});