Agent Skills: agents-md-review

Review a PR/diff for whether it makes the repo's AGENTS.md or CLAUDE.md stale, and audit those two files for anti-patterns (generic filler, tools named without runnable commands, stale paths). Classifies the change's materiality High/Medium/Low and demands an instructions update for High. Use as the AGENTS.md reviewer in a review panel, or when asked whether a change needs an AGENTS.md/CLAUDE.md update.