apm-retrofit

Retrofit an existing skills/plugins/agents repository into an APM-compliant package. Use when a repo contains SKILL.md files, a plugin.json, AGENTS.md/CLAUDE.md, MCP manifests, hooks, slash commands, or sub-agents but has no apm.yml (or has an incomplete one), and the user wants it installable via `apm install owner/repo`. TRIGGER when the user says "make this APM-compliant", "add an apm.yml", "convert my skills repo to APM", "retrofit for APM", or runs `/apm-retrofit`. SKIP when the repo already has a correctly-shaped apm.yml covering every primitive present, or the repo is not an agent-config repo (e.g. a regular application).