Scaffold the two files that enable the rules-ex extended-rules system for this project. Both files are templates — they will not be overwritten if they already exist. The canonical template content lives in this skill's assets/templates/ folder (also used by the setup-all skill's Phase 4 — treat it as the single source of truth and edit it there, not inline in either SKILL.md).

What gets created:

.claude/rules/rules-ex-authoring.md — a native path-scoped rule that auto-injects an authoring guide whenever you Read/Edit a file under .claude/rules-ex/. Required so the guide fires for the current repo (native .claude/rules files only govern the repo they live in).
.claude/rules-ex/README.md — explains what the rules-ex folder is and how to author rules in it. Has no paths: front matter intentionally, so the hook ignores it.

setup-rules-ex

Steps