feat(cli): add plain/no-emoji/no-color + help

tests/output.test.ts

@@ -0,0 +1,22 @@
+import { describe, expect, it } from 'vitest';
+import { labelPrefix, resolveOutputConfigFromArgv, statusPrefix } from '../src/lib/output.js';
+
+describe('output', () => {
+  it('plain disables emoji + color', () => {
+    const cfg = resolveOutputConfigFromArgv(['--plain'], {}, true);
+    expect(cfg).toEqual({ plain: true, emoji: false, color: false });
+    expect(statusPrefix('ok', cfg)).toBe('[ok] ');
+    expect(labelPrefix('url', cfg)).toBe('url: ');
+  });
+
+  it('NO_COLOR disables colors by default', () => {
+    const cfg = resolveOutputConfigFromArgv([], { NO_COLOR: '1' }, true);
+    expect(cfg.color).toBe(false);
+  });
+
+  it('--no-emoji switches to text prefixes', () => {
+    const cfg = resolveOutputConfigFromArgv(['--no-emoji'], {}, true);
+    expect(cfg.emoji).toBe(false);
+    expect(statusPrefix('warn', cfg)).toBe('Warning: ');
+  });
+});