- marketplace.json: fix self-improving-agent entry (add version, author, rename tags→keywords), update engineering-skills count (21→23) - c-level-advisor/plugin.json: replace explicit skills/scripts arrays with "skills": "./" auto-discovery, remove namespace field - executive-mentor/plugin.json: same — use auto-discovery, fix author format, remove namespace/scripts/references fields Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>