Enable npm engine-strict to test for unsupported dependencies

[bmish]

Detect issues like:

• Incompatible dependency: glob requires Node 20+ #508

It turns a warning into a fatal error so that the issue would be caught on CI when testing against the supported Node versions:

❯ npm ci
npm ERR! code EBADENGINE
npm ERR! engine Unsupported engine
npm ERR! engine Not compatible with your version of node/npm: [email protected]
npm ERR! notsup Not compatible with your version of node/npm: [email protected]
npm ERR! notsup Required: {"node":"20 || >=22"}
npm ERR! notsup Actual:   {"npm":"10.5.0","node":"v18.20.2"}

Personally, I wish this was the default behavior.