Add ckorhonen packs: claude-skills, swe-skills, hone-skills

[ckorhonen]

Three community skill packs to add under ## 🧠 Agent Skills.

• claude-skills — Broader 45+ skill collection across engineering, hygiene, design, workflows. MIT. Active install pull (~625 via skills.sh).
• swe-skills — 15 swe: skills for engineering analysis: PR risk review, test gap hunting, performance profiling, ownership mapping.
• hone-skills — 8 hone: skills on a cadence (daily/weekly/per-PR) to fight code entropy.

All three follow the Agent Skills standard with .claude-plugin/plugin.json manifests. Hub: https://cdd.dev/skills/