Add GitHub Actions for npm deploy (release + snapshot)

[jskupsik]

Summary

• Add deployRelease and deploySnapshot GitHub Actions workflows for publishing to npm
• Use shared composite actions from xh/hoist-dev-utils@master (validate-release-version, create-tag-and-github-release, prepare-npm-snapshot-version)
• Add .nvmrc for consistent Node.js version in CI

Details

deployRelease — manually triggered from master (or a hotfix branch). Validates the version, publishes to npm (with --tag hotfix for hotfix releases), then tags the commit and creates a GitHub release with auto-generated notes.

deploySnapshot — auto-triggered on push to develop (also supports manual dispatch with optional version override). Prepares a timestamped SNAPSHOT version and publishes with the next dist-tag.

Both workflows follow the conventions established in hoist-dev-utils, including comments, concurrency settings, and hotfix support.

Test plan

• Verify deploySnapshot triggers on push to develop and publishes with next tag
• Verify deployRelease from master validates version, publishes, tags, and creates GitHub release
• Verify hotfix release from a non-master/non-develop branch publishes with hotfix tag

🤖 Generated with Claude Code