feat(skills): add autonomous-loops and plankton-code-quality skills
- autonomous-loops: 6 loop patterns from simple claude -p pipelines to
RFC-driven DAG orchestration (Ralphinho, infinite-agentic-loop,
continuous-claude, de-sloppify pattern)
- plankton-code-quality: write-time enforcement integration guide
- README: updated directory listing and Plankton description
Sources: enitrat/ralphinho, disler/infinite-agentic-loop,
AnandChowdhary/continuous-claude, alexfazio/plankton