The npm trusted publisher may only stage, so a version goes live once a
maintainer approves it with 2FA. Staging needs npm 11.15 or later; Node 24.12
ships 11.6, so the job installs a pinned npm first.
Replaces the Drone pipeline: npmjs is where this package is distributed, and
Verdaccio proxies it. No npm token: the workflow's OIDC identity is the npm
trusted publisher, and npm records provenance for the tag's commit.