Add help shortcut regression test

tests/cli-help-shortcuts.test.ts

@@ -0,0 +1,42 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+
+process.env.MCPORTER_DISABLE_AUTORUN = '1';
+const cliModulePromise = import('../src/cli.js');
+
+describe('mcporter help shortcuts (hidden)', () => {
+  let previousNoForceExit: string | undefined;
+
+  beforeEach(() => {
+    previousNoForceExit = process.env.MCPORTER_NO_FORCE_EXIT;
+    process.env.MCPORTER_NO_FORCE_EXIT = '1';
+  });
+
+  afterEach(() => {
+    vi.restoreAllMocks();
+    process.exitCode = undefined;
+    if (previousNoForceExit === undefined) {
+      delete process.env.MCPORTER_NO_FORCE_EXIT;
+    } else {
+      process.env.MCPORTER_NO_FORCE_EXIT = previousNoForceExit;
+    }
+  });
+
+  const cases: Array<{ args: string[]; expectSnippet: string }> = [
+    { args: ['call', '--help'], expectSnippet: 'Usage: mcporter call' },
+    { args: ['call', 'help'], expectSnippet: 'Usage: mcporter call' },
+    { args: ['auth', '--help'], expectSnippet: 'Usage: mcporter auth' },
+    { args: ['auth', 'help'], expectSnippet: 'Usage: mcporter auth' },
+    { args: ['list', '--help'], expectSnippet: 'Usage: mcporter list' },
+    { args: ['list', 'help'], expectSnippet: 'Usage: mcporter list' },
+  ];
+
+  it.each(cases)('prints help for %j', async ({ args, expectSnippet }) => {
+    const { runCli } = await cliModulePromise;
+    const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => {});
+
+    await runCli(args);
+
+    expect(errorSpy).toHaveBeenCalledWith(expect.stringContaining(expectSnippet));
+    expect(process.exitCode).toBe(0);
+  });
+});