[MaggieCabrera]

Description

Part of #75. AGENTS.md now covers the theme itself, so it can ship with the copy in WordPress core, like DESIGN.md does. That way it helps agents editing Ipsum or building on it anywhere, not only in this repository.

• The dev environment notes, the pre-commit details and the pull request instructions move to CONTRIBUTING.md. AGENTS.md points there for work in this repository.
• Links into CONTRIBUTING.md are full GitHub URLs, so they work from a copy that doesn't have it.
• DESIGN.md now links to AGENTS.md for working on the theme's files.

Testing Instructions

1. Read AGENTS.md as if you only had the theme's files. Nothing in it should depend on this repository's tooling.
2. Check that what left AGENTS.md is in CONTRIBUTING.md: the dev environment, the pre-commit hook fallback, Version: staying at 1.0 and the pull request instructions.

Use of AI Tools

AI assistance: Yes
Tool(s): Claude Code
Model(s): Claude Opus 5.5
Used for: Splitting the file, moving the repository-only parts and this description.

🤖 Generated with Claude Code

[github-actions]

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If you're merging code through a pull request on GitHub, copy and paste the following into the bottom of the merge commit message.

Co-authored-by: MaggieCabrera <onemaggie@git.wordpress.org>
Co-authored-by: juanfra <juanfra@git.wordpress.org>

To understand the WordPress project's expectations around crediting contributors, please review the Contributor Attribution page in the Core Handbook.

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[juanfra]

Thanks @MaggieCabrera! Small nit

[juanfra]

Nit: One thing I noticed is that we have .nvmrc, package.json and package-lock.json in core already (https://github.com/WordPress/wordpress-develop/tree/trunk/src/wp-content/themes/ipsum).

I read in the sync PR description that's for the default's theme workflow. Should we update this?