quality/package-engines

Adds a devEngines field to package.json with the expected Node.js version and package manager, for example:

{
  "devEngines": {
    "runtime": { "name": "node", "version": ">=22" },
    "packageManager": { "name": "pnpm", "version": ">=9" }
  }
}

The Node version comes from .nvmrc, engines.node, or a default of 22 (written as >=22). packageManager.version defaults to >=9 for pnpm and >=10 for npm, yarn, or bun, and uses an existing packageManager field when present. Existing devEngines values take precedence during the merge.