Add repo config audit guidance

[FarPointer]

Summary

• add repo-level guidance for configuration and workflow recommendation requests
• add a repo-specific repo-config-audit skill for setup and instruction audits
• document the new skill and its recommendation-first boundary in the skills README

Testing

• not run (instruction and skill text changes only)

[Copilot]

Pull request overview

This PR adds repo-level guidance and a new skill to standardize how configuration/workflow recommendation requests are handled by agents, ensuring audits start from the repository’s actual instruction surfaces and stay recommendation-first until explicitly asked to implement.

Changes:

• Expanded AGENTS.md with guidance for recommendation-first workflows and a new section describing how repo-level instructions vs. skills should be structured.
• Added a new repo-specific skill, repo-config-audit, to audit instruction/skill/agent setup and produce evidence-backed recommendations.
• Documented the new skill and its recommendation-only boundary in the skills index README.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
AGENTS.md	Adds repo-level guidance for configuration/workflow recommendation requests and clarifies where instruction doctrine should live.
.github/skills/repo-config-audit/SKILL.md	Introduces a new skill defining a concrete, evidence-based audit workflow and deliverable for repo configuration advice.
.github/skills/README.md	Registers and explains the new repo-config-audit skill and its recommendation-first boundary.

---

💡 Add a code-review agent skill or configure MCP servers for context-aware, tailored reviews. Learn more in the docs.