feat: add Copilot/AI instructions and framework instruction sync

[aryanjasala]

Summary

Adds Copilot/AI review instructions to the skeleton and wires it to receive the shared rules from rtcamp/wp-framework via npm run sync-ai.

What's included

• .github/copilot-instructions.md — repo-wide overview + review conduct.
• .github/instructions/structure.instructions.md — layout and wiring.
• AGENTS.md (tool-agnostic brief) + thin CLAUDE.md that defers to it.
• package.json — sync-ai script (refreshes the framework rules from vendor and projects instructions to the wp-content root); chained from npm run init.
• bin/init.js — no longer skips .github, so placeholder names are renamed there too at init.

How instructions arrive

npm run sync-ai (run by npm run init, or manually after composer update) reads the framework rules from vendor/rtcamp/wp-framework and writes the package's framework-php.instructions.md. No Composer hooks, so there is no install-order coupling.

Depends on

rtcamp/wp-framework (feat/ai-instructions). The generated .github/instructions/framework-php.instructions.md is produced by npm run sync-ai once the framework change is available, then committed in a follow-up.

[Copilot]

Pull request overview

This PR introduces repository-level AI agent instructions and adds a sync-ai workflow to pull shared instruction rules from rtcamp/wp-framework, plus adjusts the init script so .github/ content participates in placeholder renames during theme initialization.

Changes:

• Add agent-facing instruction entrypoints (AGENTS.md, CLAUDE.md, .github/copilot-instructions.md) and a theme structure instruction file under .github/instructions/.
• Add npm run sync-ai and chain it from npm run init.
• Update bin/init.js to include .github/ in init-time search/replace.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
package.json	Adds sync-ai script and chains it from init.
CLAUDE.md	Adds Claude entrypoint that defers to AGENTS.md.
bin/init.js	Allows init-time replacements to apply inside .github/.
AGENTS.md	Adds tool-agnostic agent brief and points to instruction sources.
.github/instructions/structure.instructions.md	Adds path-scoped theme structure rules for inc/**.
.github/copilot-instructions.md	Adds Copilot overview + review conduct rules and points to instruction files.

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