feat(cli): add @videojs/cli docs command for LLM-friendly installation (#1214)

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/cli/src/utils/tests/replace.test.ts

@@ -0,0 +1,65 @@
+import { describe, expect, it } from 'vitest';
+import { replaceMarker } from '../replace.js';
+
+describe('replaceMarker', () => {
+  it('replaces content between markers', () => {
+    const markdown = `# Title
+
+<!-- cli:replace test -->
+old content here
+<!-- /cli:replace test -->
+
+## Footer`;
+
+    const result = replaceMarker(markdown, 'test', 'new content');
+    expect(result).toBe(`# Title
+
+new content
+
+## Footer`);
+  });
+
+  it('returns unchanged markdown when marker not found', () => {
+    const markdown = '# Title\n\nSome content';
+    const result = replaceMarker(markdown, 'missing', 'replacement');
+    expect(result).toBe(markdown);
+  });
+
+  it('preserves content before and after markers', () => {
+    const markdown = `before
+<!-- cli:replace id -->
+middle
+<!-- /cli:replace id -->
+after`;
+
+    const result = replaceMarker(markdown, 'id', 'replaced');
+    expect(result).toContain('before');
+    expect(result).toContain('after');
+    expect(result).toContain('replaced');
+    expect(result).not.toContain('middle');
+  });
+
+  it('treats $ patterns in replacement literally', () => {
+    const markdown = `start
+<!-- cli:replace test -->
+old
+<!-- /cli:replace test -->
+end`;
+
+    const result = replaceMarker(markdown, 'test', 'https://example.com/video.php?id=$1&ref=$&');
+    expect(result).toContain('https://example.com/video.php?id=$1&ref=$&');
+  });
+
+  it('handles multiline content between markers', () => {
+    const markdown = `start
+<!-- cli:replace multi -->
+line 1
+line 2
+line 3
+<!-- /cli:replace multi -->
+end`;
+
+    const result = replaceMarker(markdown, 'multi', 'single line');
+    expect(result).toBe('start\nsingle line\nend');
+  });
+});