feat: add skills field to agents for auto-loading relevant skills

[sjnims]

Summary

• Adds the skills frontmatter field to all 3 agents to auto-load relevant skill documentation when invoked
• Makes agents more self-contained and effective by providing them with domain-specific best practices

Problem

Fixes #118

The plugin's agents don't leverage the skills frontmatter field to auto-load relevant context. Users need to manually load skills first, or agents operate without that documentation context.

Solution

Add skills field to each agent's frontmatter:

Agent	Skills Auto-loaded
agent-creator	agent-development
plugin-validator	plugin-structure, hook-development, command-development, skill-development, agent-development
skill-reviewer	skill-development

Alternatives Considered

1. Status quo: Users manually load skills (current behavior)
2. Document in prompts: Add references in system prompt text (doesn't auto-load)
3. Single skill per agent: Only load most relevant skill (less comprehensive for plugin-validator)

Chose the approach from the issue which provides comprehensive coverage while being targeted to each agent's needs.

Changes

• agent-creator.md: Added skills: agent-development
• plugin-validator.md: Added skills: plugin-structure, hook-development, command-development, skill-development, agent-development
• skill-reviewer.md: Added skills: skill-development

Testing

• All modified files pass markdownlint
• Skills referenced exist in the plugin

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PR Review: Add skills field to agents

Reviewing PR #120: feat: add skills field to agents for auto-loading relevant skills

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Summary

✅ APPROVED - This PR successfully implements the skills frontmatter field for all three agents, making them more self-contained and effective.

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What's Good

1. Clean, targeted implementation: Each agent file gets exactly one line added - the skills field in the frontmatter
2. Thoughtful skill selection:
   • agent-creator: Gets agent-development - focused and relevant
   • plugin-validator: Gets comprehensive coverage (plugin-structure, hook-development, command-development, skill-development, agent-development) - appropriate for a validator that checks all component types
   • skill-reviewer: Gets skill-development - perfectly scoped
3. All referenced skills exist: Verified that all 5 unique skills referenced exist in the plugin
4. Markdown quality: All files pass markdownlint with no issues
5. Proper frontmatter placement: Skills field added after tools and before the closing ---, maintaining consistent formatting
6. Well-documented PR: Clear problem statement, solution rationale, and testing evidence

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Checklist Verification

Based on the custom review instructions:

• ✅ Agents: Frontmatter is valid, skills field properly formatted as comma-separated list
• ✅ Markdown Quality: markdownlint passes with no errors on all three files
• ✅ Documentation: PR body clearly explains the change; no user-facing docs need updating since this is an internal agent improvement

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Technical Review

Changes Made:

# agent-creator.md
+skills: agent-development

# plugin-validator.md  
+skills: plugin-structure, hook-development, command-development, skill-development, agent-development

# skill-reviewer.md
+skills: skill-development

Validation Performed:

• All 5 referenced skills exist in plugins/plugin-dev/skills/:
  • ✅ agent-development
  • ✅ command-development
  • ✅ hook-development
  • ✅ plugin-structure
  • ✅ skill-development
• Frontmatter syntax is correct (YAML list format)
• Placement is consistent across all three agent files

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Impact Assessment

This change will improve agent effectiveness by:

1. Auto-loading relevant documentation context when agents are invoked
2. Reducing manual work for users (no need to manually load skills first)
3. Ensuring agents have domain-specific best practices available
4. Making agents more self-contained and reliable

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Recommendations

None - This PR is ready to merge as-is. The implementation is clean, well-tested, and aligns with the issue requirements (#118).

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