Remove Repo-Relative Link from Installed Copilot Skill

[ptr727]

Finding

The canonical .agents/skills/copilot-instructions-keeper/SKILL.md links to a sibling skill through a repo-relative inline Markdown link:

[`carried-instruction-file-guard`](../carried-instruction-file-guard/SKILL.md)

Generated downstream copies preserve that link. It conflicts with the reference-style link convention, and the relative path is not reliable when the skill is installed outside the repository checkout.

Expected

Name the sibling skill without a repo-relative Markdown link, then regenerate the carried skill distributions.

Evidence

• Downstream review: PR Update dependencies and enhance workflow configurations #33, current head 705e21a
• Canonical hub revision: 241bfd0
• Carried-tree digest matches the canonical hub tree at that revision.
• Audit: audit run 2026-08-19T19:34:20Z | hub 241bfd0 | branch override resync/hub-20260818