fix: unify Commander to v13 across all packages (prdy, mosaic)

Stale commander@12 in @mosaic/prdy and @mosaic/mosaic caused type
mismatch with @mosaic/cli and @mosaic/quality-rails (both on v13).

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

packages/mosaic/package.json

@@ -32,7 +32,7 @@
     "@mosaic/quality-rails": "workspace:*",
     "@mosaic/types": "workspace:*",
     "@clack/prompts": "^0.9.1",
-    "commander": "^12.1.0",
+    "commander": "^13.0.0",
     "picocolors": "^1.1.1",
     "yaml": "^2.6.1",
     "zod": "^3.23.8"