Modernizing the lenne.tech Toolchain

When This Skill Activates

Migrating an existing API/App from jest → vitest, eslint → oxlint, prettier → oxfmt
Adopting the check / check:fix / check:envs pipeline used by the starters
Debugging Mongoose "Cannot determine a type for the X field (union/intersection/ambiguous type was used)" after switching to vitest+SWC
Debugging ERR_SOCKET_BAD_PORT from node .output/server/index.mjs in any check pipeline
Debugging missing or stale types.gen.ts after a Nuxt update
Aligning a project with the current config.env.ts shape (NSC__-only + fail-fast + helper functions)
Cleaning up phantom Unix-domain-sockets named [33m12345[39m in the project root

All references in this skill are to the public lenne.tech repos. Never reference local clone paths in skill output: