Add YAML metadata blocks to GitHub agent markdown files

[Copilot]

GitHub requires agent markdown files to have YAML front matter with name and description fields for proper recognition and display.

Changes

• Added YAML metadata blocks to all three agent files:
  • documentation-writer.md
  • software-quality-enforcer.md
  • project-maintainer.md

Each file now begins with:

---
name: <Agent Name>
description: <Agent description summarizing responsibilities>
---

# <Agent Name>

The descriptions are derived from the agent summaries already documented in AGENTS.md, ensuring consistency across the repository.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[Feature]: Add heading to github agent markdown files</issue_title>
<issue_description>### Problem Statement

The custom GitHub agent files aren't showing up in GitHub

Proposed Solution

The GitHub Agent markdown files MUST have a YAML metadata block specifying the agents name and description - such as:

---
name: <agent name>
description: <agent description>
---

# <Agent Name>

etc...

Alternatives Considered

No response

Usage Examples

Benefits

Make the agent files functional with GitHub

Priority

High - Blocking my use case

Willingness to Contribute

Yes, I can submit a pull request

Additional Context

No response

Checklist

• I have searched existing issues to ensure this is not a duplicate
• I have provided a clear description of the feature
• I have explained why this feature would be useful</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [Feature]: Add heading to github agent markdown files #44

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