docs: add LICENSE, NOTICE, README, CHANGELOG, and npm metadata
The public repo shipped with no license, readme, or changelog. Add them plus standard package metadata (license field, keywords, author, homepage, repository, bugs) so the Gitea/npm pages present the package professionally. README and CHANGELOG describe the exports this repo actually contains. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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