feat: align SDK with updated OpenAPI spec and add missing unit tests

- Update generated types from new openapi.yaml (capsule stats, usage,
  metrics, pause/resume lifecycle, host/channel management, auth flow)
- Add Capsule pause/resume/ping/getMetrics lifecycle methods
- Add Capsule.waitForReady abort signal support
- Add PtyManager.connect and PtySession disposal
- Fix HttpClient empty-body response handling (content-length: 0)
- Add streamProcess() to CommandManager for background process streams
- Add integration tests for capsule lifecycle, git, and PTY features
- Add unit tests for AsyncQueue error paths, PtySession.close,
  Git.checkout without create, Git.add single string,
  Notebook.execCell error case, and PtyStartOptions fields

tests/code-interpreter.test.ts

@@ -1,9 +1,13 @@
-import { describe, expect, it, vi } from "vitest";
+import { afterEach, describe, expect, it, vi } from "vitest";
 
 import { Capsule } from "../src/capsule.js";
 import { CodeInterpreter } from "../src/code-interpreter/index.js";
 
 describe("CodeInterpreter", () => {
+	afterEach(() => {
+		vi.restoreAllMocks();
+	});
+
 	it("creates a capsule with the jupyter template by default", async () => {
 		const create = vi.spyOn(Capsule, "create").mockResolvedValue(
 			new Capsule("cap_1", {
@@ -19,7 +23,6 @@ describe("CodeInterpreter", () => {
 		expect(create).toHaveBeenCalledWith("jupyter", {
 			baseUrl: "https://api.example.com",
 		});
-		create.mockRestore();
 	});
 
 	it("connects to an existing capsule", () => {
@@ -53,4 +56,34 @@ describe("CodeInterpreter", () => {
 			timeoutSec: 30,
 		});
 	});
+
+	it("returns stderr and non-zero exit code on failure", async () => {
+		const capsule = new Capsule("cap_1", {
+			baseUrl: "https://api.example.com",
+		});
+		vi.spyOn(capsule.commands, "exec").mockResolvedValue({
+			exit_code: 1,
+			stderr: "SyntaxError: invalid syntax\n",
+			stdout: "",
+		});
+		const interpreter = new CodeInterpreter(capsule);
+
+		await expect(interpreter.notebook.execCell("invalid(")).resolves.toEqual({
+			exitCode: 1,
+			stderr: "SyntaxError: invalid syntax\n",
+			stdout: "",
+		});
+	});
+
+	it("disposes the wrapped capsule", async () => {
+		const capsule = new Capsule("cap_1", {
+			baseUrl: "https://api.example.com",
+		});
+		const dispose = vi.spyOn(capsule, Symbol.asyncDispose).mockResolvedValue();
+		const interpreter = new CodeInterpreter(capsule);
+
+		await interpreter[Symbol.asyncDispose]();
+
+		expect(dispose).toHaveBeenCalledOnce();
+	});
 });