v0.2.2 — veracium-mcp --help/--version + clear boot errors

• veracium-mcp CLI: --help and --version now work (previously any
  argument was ignored and the stdio server booted silently — confusing on a
  first install); unknown arguments fail with a pointer to --help; a boot
  failure (e.g. missing ANTHROPIC_API_KEY) exits with a clear one-line
  message instead of a traceback.