[FEATURE] Enhance the generated skills description for more stable triggering

[whinc]

🚀 Feature Description

Current description is just describe WHAT that may lead skills will be trigger as expect. This is generated mathjs skills frontmatter:

---
name: mathjs
description: Comprehensive assistance with mathjs
---

Accroding to claude code offical documetations, skills description should be "Brief description of what this Skill does and when to use it" which will make claude more stable triggering current skill.

💡 Use Case

Describe the problem this feature would solve. What is the user trying to accomplish?

📋 Proposed Solution

Enhance the generated skill description by proper prompat, e.g. ""Brief description of what this Skill does and when to use it"

🔄 Alternatives Considered

Have you considered any alternative solutions or workarounds?

📊 Expected Impact

• Priority: Low / Medium / High / Critical
• Effort: XS / S / M / L / XL
• Users Affected: Describe who would benefit

📝 Additional Context

Add any other context, screenshots, or examples about the feature request.

✅ Acceptance Criteria

• Criteria 1
• Criteria 2
• Criteria 3