/agents generator should capture skills from user descriptions

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

Current Behavior: When using /agents with "Generate with Claude", skill mentions in descriptions don't populate the skills frontmatter
field.

Why It Matters: The skills field IS supported but has no generation workflow path—users must manually edit files afterward.

Proposed Solution

Suggested Improvements:

1. Parse descriptions for skill mentions
2. Add interactive skill selection step (like tools/model)
3. Auto-populate skills field in generated frontmatter

Alternative Solutions

_No response_

Priority

Critical - Blocking my work

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

_No response_