Publish the Pxxl CLI to npm

Run this from the root of pxxlspace/pxxlspace.

npm login
npm test
npm run build
npm pack --dry-run
npm version patch
npm publish --access public

The package publishes as @pxxlapp/pxxl because npm blocks the bare pxxl name for similarity with existing packages. The installed binary remains pxxl. Recommended release checks:

Check	Why
`npm test`	Builds the SDK and runs CLI/unit tests.
`npm pack --dry-run`	Confirms only `dist`, guides, boilerplates, skills, and package metadata ship.
npm 2FA	Protects releases from account compromise.
provenance	Adds publish-chain metadata where supported.
smoke install	Verifies the binary works after publish.

npm install -g @pxxlapp/pxxl
pxxl --help