Add Emdash Skills to Agent Skills section

[ProfessorManhattan]

Summary

Adds Emdash Skills to the Agent Skills section.

• Name: Emdash Skills
• URL: https://github.com/megabytespace/claude-skills
• Description: 14-category autonomous product-building OS for AI coding tools. 94 reference docs, 18 agents. One-line prompts to deployed products on Cloudflare Workers.

The entry is placed alphabetically among the non-starred GitHub entries in the Agent Skills section, matching the existing list format.