Pass ~open_modules:["Stdlib"] to Resolver.create, mirroring the compiler's (and the driver's link-time) default environment, so `switchdocs show List` resolves to Stdlib.List and `switchdocs show print_endline` works. Modules not documented in the switch are skipped by Env.open_units, so this is safe. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>