Replace GitHub agents with TemplateDotNetLibrary agents

[Copilot]

Replaces the 3 existing project-specific agents with the 6 agents from TemplateDotNetLibrary, translated for this repository.

Agent Changes

Removed:

• documentation-writer.md
• software-quality-enforcer.md
• project-maintainer.md

Added (from template):

• code-quality-agent.md — linting, static analysis, quality gates
• repo-consistency-agent.md — checks this repo against TemplateDotNetLibrary; TemplateDotNetLibrary references intentionally preserved
• requirements-agent.md — requirements development and test linkage
• software-developer.md — production code, literate programming style
• technical-writer.md — documentation with template-specific markdown rules
• test-developer.md — unit tests, AAA pattern

All "Template DotNet Library" heading references translated to "TestResults" except in repo-consistency-agent.md, where the upstream template references are load-bearing.

Updated: AGENTS.md agent listing reflects the new set.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Code quality improvement

Pre-Submission Checklist

Build and Test

• Code builds successfully: dotnet build --configuration Release
• All tests pass: dotnet test --configuration Release
• Code produces zero warnings

Code Quality

• Code formatting is correct: dotnet format --verify-no-changes
• New code has appropriate XML documentation comments
• Static analyzer warnings have been addressed

Quality Checks

• Spell checker passes: cspell "**/*.{md,cs}"
• Markdown linter passes: markdownlint "**/*.md"
• YAML linter passes: yamllint '**/*.{yml,yaml}'

Testing

• Added unit tests for new functionality
• Updated existing tests if behavior changed
• All tests follow the AAA (Arrange, Act, Assert) pattern
• Test coverage is maintained or improved

Documentation

• Updated README.md (if applicable)
• Updated ARCHITECTURE.md (if applicable)
• Added code examples for new features (if applicable)
• Updated requirements.yaml (if applicable)

Additional Notes

The repo-consistency-agent.md is present in this downstream repo (not just the template) because its purpose is to check this repo's consistency against the template — invoking it here is the intended use case.

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