Update skills directory

Keep .agents/skills/ aligned with agent-skill best practices: one SKILL.md per skill, optional flat references/, scripts/, or assets/ folders, and a repo-root 02-SKILLS.md index. Skill folders are agent artifacts, so do not create per-skill README.md files.

Process

1. Enumerate

List every immediate subfolder of .agents/skills/ and read 02-SKILLS.md if it exists.

Done when every skill folder and every current index entry is accounted for.

2. Audit each skill

For every skill folder, check: