feat(cli): add prdy, quality-rails, and wizard subcommands

Wires @mosaic/prdy, @mosaic/quality-rails, and @mosaic/mosaic into the
unified CLI binary. The wizard subcommand uses dynamic import to avoid
loading heavy wizard deps for other commands. Adds @types/node to cli
devDependencies and guards @mosaic/mosaic index.ts program.parse() so
the module is safely importable without auto-executing.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/mosaic/src/index.ts

@@ -1,4 +1,7 @@
 #!/usr/bin/env node
+import { resolve } from 'node:path';
+import { fileURLToPath } from 'node:url';
+
 import { Command } from 'commander';
 import { ClackPrompter } from './prompter/clack-prompter.js';
 import { HeadlessPrompter } from './prompter/headless-prompter.js';
@@ -8,7 +11,12 @@ import { WizardCancelledError } from './errors.js';
 import { VERSION, DEFAULT_MOSAIC_HOME } from './constants.js';
 import type { CommunicationStyle } from './types.js';
 
-export { VERSION };
+export { VERSION, DEFAULT_MOSAIC_HOME };
+export { runWizard } from './wizard.js';
+export { ClackPrompter } from './prompter/clack-prompter.js';
+export { HeadlessPrompter } from './prompter/headless-prompter.js';
+export { createConfigService } from './config/config-service.js';
+export { WizardCancelledError } from './errors.js';
 
 const program = new Command()
   .name('mosaic-wizard')
@@ -70,4 +78,7 @@ program
     }
   });
 
-program.parse();
+const entryPath = process.argv[1] ? resolve(process.argv[1]) : '';
+if (entryPath.length > 0 && entryPath === fileURLToPath(import.meta.url)) {
+  program.parse();
+}