Skill Builder

Installs 5 skills for creating new Sage skills:

• pack-discover — Find patterns and anti-patterns in source material
• pack-draft — Draft skill files with proper structure
• pack-observe — Learn from existing codebases
• pack-source-process — Process source books and documentation
• pack-validate — Validate skill quality against contracts

Note: These skills will be renamed from pack-* to skill-* in a future version.