Add impeccable CLI with detect subcommand

Usage: npx impeccable detect [file-or-dir-or-url...]

Subcommand structure designed for future expansion. The detect
subcommand delegates to the existing detection engine with all
its modes (jsdom, regex, Puppeteer).

- bin/impeccable.mjs: CLI entry point with bun shebang
- package.json: bin field added
- Export detectCli (main) from detection script
- Updated help text to show impeccable detect usage
- Updated CLAUDE.md and README.md with CLI docs

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

bin/impeccable.mjs

@@ -0,0 +1,43 @@
+#!/usr/bin/env bun
+
+/**
+ * Impeccable CLI
+ *
+ * Usage:
+ *   npx impeccable detect [file-or-dir-or-url...]
+ *   npx impeccable detect --fast --json src/
+ *   npx impeccable --help
+ */
+
+const args = process.argv.slice(2);
+const command = args[0];
+
+if (!command || command === '--help' || command === '-h') {
+  console.log(`Usage: impeccable <command> [options]
+
+Commands:
+  detect [file-or-dir-or-url...]   Scan for UI anti-patterns and design quality issues
+
+Options:
+  --help    Show this help message
+
+Run 'impeccable detect --help' for detection-specific options.`);
+  process.exit(0);
+}
+
+if (command === '--version' || command === '-v') {
+  const pkg = await import('../package.json', { with: { type: 'json' } });
+  console.log(pkg.default.version);
+  process.exit(0);
+}
+
+if (command === 'detect') {
+  // Remove 'detect' from argv so the detection script sees the right args
+  process.argv = [process.argv[0], process.argv[1], ...args.slice(1)];
+  const { detectCli } = await import('../source/skills/critique/scripts/detect-antipatterns.mjs');
+  await detectCli();
+} else {
+  console.error(`Unknown command: ${command}`);
+  console.error(`Run 'impeccable --help' for available commands.`);
+  process.exit(1);
+}