Add npm publishing checklist and package dry-run docs

[erkininfinity]

Goal

Document the npm publishing workflow for agentready-kit.

Suggested scope

• Add a short section to the README or a new docs page.
• Include npm pack --dry-run and npm publish guidance.
• Mention that agentready-kit is the package name and npx agentready-kit is the public command.

Why this helps

Clear release instructions reduce publishing mistakes and help future maintainers.