dsh-skill-lazy: DSH Skill Catalog Lazy Loading and On-Demand Retrieval

The `dsh-skill-lazy` plugin is designed to address the issue of extensive context Token consumption caused by the skills directory in DeepSeek Harness. It uses compact directory injection and on-demand retrieval mechanisms, displaying only brief summaries in each session and retrieving full descriptions via a tool as needed. The plugin also provides MECE checks, cost auditing, and directory sorting based on invocation frequency, helping users optimize skill library management and reduce storage costs.