Add GitHub custom AI agents for documentation, maintenance, and quality

[Copilot]

• Create .github/agents directory
• Create documentation writer agent (documentation-writer.md)
• Create project maintainer agent (project-maintainer.md)
• Create software quality enforcer agent (software-quality-enforcer.md)
• Verify all agent files have proper YAML metadata blocks
• Update AGENTS.md to reference the new custom agents
• Fix markdown linting error (duplicate heading in project-maintainer.md)
• Add "Triaging" to spell check dictionary
• Simplify Available Agents section to avoid duplication with agent files
• Run build and test validation (all 127 tests passed)
• Request code review (no issues found)
• Run security scanning (no code changes to analyze)
• Verify all linting checks pass (markdown, YAML, spell check)

Original prompt

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This section details on the original issue you should resolve

<issue_title>[Feature]: Add github custom AI agents</issue_title>
<issue_description>### Problem Statement

Agents are needed with specific roles and responsibilities.

Proposed Solution

Create a .github/agents with markdown files defining the following agents:

• documentation writer
• project maintainer
• software quality enforcer

Remember that agent markdown files must have a yaml metadata block containing the agent name and description.

Alternatives Considered

No response

Additional Context

No response

Priority

Medium - Would improve workflow

Contribution

• I would be willing to submit a PR for this feature

Code of Conduct

• I agree to follow this project's Code of Conduct</issue_description>

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

• Fixes [Feature]: Add github custom AI agents #27

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