Add wp-env skill for local WordPress development

[rushikeshmore]

What?

Adds a new wp-env skill that teaches AI coding assistants how to set up, configure, and troubleshoot local WordPress development environments using @wordpress/env.

Addresses the community request in #9 (comment from @owlot: "Would love to see an wp-env skill").

Why?

@wordpress/env is the official Docker-based local development tool for WordPress plugin and theme development. It's referenced throughout the Gutenberg docs and used by core contributors, but there's no agent skill covering it. AI assistants currently guess at wp-env configuration and often make mistakes like using bare plugin slugs instead of ZIP URLs, or not checking Docker status before starting.

How?

New skill: skills/wp-env/SKILL.md

• All 7 required sections (When to use, Inputs required, Procedure, Verification, Failure modes, Escalation)
• Covers: installation, auto-detection (plugin/theme/core), .wp-env.json configuration, source string formats, WP-CLI commands, PHPUnit testing, Xdebug setup, multisite, override files, environment management
• Common gotchas table (port conflicts, bare slugs, override merge behavior, Docker not running)

Eval scenarios: 2 JSON scenarios

• wp-env-start-plugin.json -- setting up wp-env for a plugin project
• wp-env-troubleshoot-port.json -- diagnosing and fixing port conflicts

README: Updated Available Skills table with wp-env entry.

Testing

• node eval/harness/run.mjs passes
• node shared/scripts/skillpack-build.mjs --clean builds successfully for all 4 targets (codex, vscode, claude, cursor)
• Skill follows required SKILL.md structure with all 7 sections
• Two eval scenarios added
• Frontmatter validates (name matches folder, compatibility includes WP 6.9 + PHP 7.2.24+)

Use of AI Tools

Claude Code was used to assist with drafting this skill. Content was verified against the official @wordpress/env documentation and source code.

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