Add TypeScript Kelos task action

[gjkim42]

Summary

• add a Node-based GitHub Action for applying or generating Kelos Task resources
• implement the action in TypeScript with a checked-in dist runtime and action metadata
• document usage and add Node tests for manifest generation and task output handling

Testing

• node --test
• node --check dist/index.js
• node --experimental-strip-types -e "require('./src/index.ts')"