Read ./harness-starter-kit first, then apply the harness engineering starter kit to this repository.
Treat the current working directory as the target repository. Treat ./harness-starter-kit as read-only reference material unless I explicitly ask you to edit the kit itself.
Preserve this repository's existing architecture, tools, package manager, commands, and conventions. Add only the minimum missing harness files. Prefer updating existing docs/configs over duplicating them. Do not overwrite or delete existing files without explaining why.
Finish with a short adoption report listing files changed, checks I can run, assumptions made, remaining manual steps, and what to do with ./harness-starter-kit before committing.