fix(npm): support clean install and npx launcher paths

- lazy-load optional installer dependencies in dist/npm/index.js
- use built-in https for latest-version lookup and release downloads
- fall back to plain logging when cli-spinner is unavailable
- keep finish-install working without local node_modules in clean checkouts
- teach npm launcher scripts to resolve index.js from the npx temp package layout
- preserve existing global npm and yarn fallback lookup behavior