chore: standardize on Node.js 24 LTS

[humanbydefinition]

Summary

• standardize local development and CI on Node.js 24 LTS
• align runtime, package-manager, Node type, and lockfile metadata where applicable
• use readable major-version tags for GitHub Actions and report the active toolchain
• preserve existing project-specific build, test, release, and deployment behavior

Validation

• completed the project validation suite locally under Node.js 24
• validated workflow YAML and confirmed no SHA-pinned uses: references remain
• verified the PR diff contains only the Node 24 migration and compatibility changes