Harness Alchemist: A General-Purpose Coding Agent Plugin Scaffold

`harness-alchemist` is a TypeScript scaffolding tool for plugin repositories, designed to address the cumbersome task of supporting different Harness formats in multi-platform agent plugin development. With its “one codebase, five Harnesses” mechanism, it uses `skill-runtime.json` to define skill contracts consistently and enable native cross-platform installation. It provides automatic scaffolding, structure validation, and manifest generation, and supports installation via npm and Rust binaries. Developers can focus on skill logic while the scaffold handles adaptation and validation, lowering the barrier to entry.