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/commands.test.ts

@@ -71,6 +71,51 @@ describe("CommandManager", () => {
 		});
 	});
 
+	it("connects to an existing background process stream", async () => {
+		const capsule = new Capsule("cap_1", {
+			baseUrl: "https://api.example.com",
+		});
+		const mockConnection = {
+			close: vi.fn(),
+			get isClosed() {
+				return false;
+			},
+			send: vi.fn(),
+		};
+		const connectProcess = vi
+			.spyOn(capsule.client.capsules, "connectProcess")
+			.mockResolvedValue(mockConnection as never);
+
+		const result = await capsule.commands.streamProcess("123");
+
+		expect(connectProcess).toHaveBeenCalledWith("cap_1", "123", {
+			onMessage: expect.any(Function),
+		});
+		expect(result).toBe(mockConnection);
+	});
+
+	it("passes timeout to streamProcess", async () => {
+		const capsule = new Capsule("cap_1", {
+			baseUrl: "https://api.example.com",
+		});
+		const connectProcess = vi
+			.spyOn(capsule.client.capsules, "connectProcess")
+			.mockResolvedValue({
+				close: vi.fn(),
+				get isClosed() {
+					return false;
+				},
+				send: vi.fn(),
+			} as never);
+
+		await capsule.commands.streamProcess("worker", { timeoutMs: 5000 });
+
+		expect(connectProcess).toHaveBeenCalledWith("cap_1", "worker", {
+			onMessage: expect.any(Function),
+			timeoutMs: 5000,
+		});
+	});
+
 	it("streams command events over the exec WebSocket", async () => {
 		const capsule = new Capsule("cap_1", {
 			baseUrl: "https://api.example.com",