Add devEngines.packageManager support

[LitoMore]

References

• https://github.com/openjs-foundation/package-metadata-interoperability-working-group/blob/main/devengines-field-proposal.md
• https://docs.npmjs.com/cli/v11/configuring-npm/package-json#devengines
• Support devEngines field pnpm/pnpm#8153

[sindresorhus]

One small issue:

devEngines.packageManager entries without a name are currently ignored and the code falls back to lockfile/default detection. npm does not do that. I double checked it by creating a package with devEngines.packageManager: {version: '>=9'} and running npm run check; npm fails immediately with Missing "name" property for "packageManager".

That means this change can silently accept an invalid manifest and then publish with a different package manager than the package actually declares. I’d rather make this error out instead of treating it as a fallback case. I think the current missing-name test should be flipped accoridngly.

[LitoMore]

@sindresorhus Nice catch. I've updated the logic and tests to check the name field.