feat: add onboarding plugin install flow

src/commands/onboarding/__tests__/test-utils.ts

@@ -0,0 +1,25 @@
+import { vi } from "vitest";
+
+import type { RuntimeEnv } from "../../../runtime.js";
+import type { WizardPrompter } from "../../../wizard/prompts.js";
+
+export const makeRuntime = (overrides: Partial<RuntimeEnv> = {}): RuntimeEnv => ({
+  log: vi.fn(),
+  error: vi.fn(),
+  exit: vi.fn(),
+  ...overrides,
+});
+
+export const makePrompter = (
+  overrides: Partial<WizardPrompter> = {},
+): WizardPrompter => ({
+  intro: vi.fn(async () => {}),
+  outro: vi.fn(async () => {}),
+  note: vi.fn(async () => {}),
+  select: vi.fn(async () => "npm") as WizardPrompter["select"],
+  multiselect: vi.fn(async () => []) as WizardPrompter["multiselect"],
+  text: vi.fn(async () => "") as WizardPrompter["text"],
+  confirm: vi.fn(async () => false),
+  progress: vi.fn(() => ({ update: vi.fn(), stop: vi.fn() })),
+  ...overrides,
+});