Skill scaffolding improvements: enhanced agr init with manifest metadata #502
Description
Summary
Enhance agr init <name> to generate a more complete skill scaffold with manifest metadata: author, version, description, license, and optionally a test harness or README.
Why
Lowers the barrier to creating and publishing skills. A good scaffold guides skill authors toward best practices and ensures skills have the metadata needed for registry listing and dependency management.
Scope
- Add interactive prompts or flags for: author, description, version, license
- Generate SKILL.md with proper frontmatter metadata
- Optionally generate a README.md for the skill
- Consider: skill templates for common patterns
- Consider: validation that generated scaffold is complete
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