Extensive agent improvements

[Copilot]

Initial full-repository scaffolding for the TemplateDotNetLibrary template, establishing agent definitions, CI/CD, compliance tooling, linting, documentation, and source/test code from scratch.

Changes

• Agent definitions (.github/agents/): 7 specialized agent instruction files — code-quality, code-review, repo-consistency, requirements, software-developer, technical-writer, test-developer
• CI/CD (.github/workflows/): Full pipeline (build.yaml) with lint → build → analyze → test → document → enforce → publish stages; push trigger and release workflows
• Issue templates: Bug report, feature request, question
• Linting: lint.sh/lint.bat, .cspell.yaml, .markdownlint-cli2.yaml, .yamllint.yaml, .editorconfig, package.json
• Compliance tooling: requirements.yaml, .reviewmark.yaml, .versionmark.yaml, .config/dotnet-tools.json (ReqStream, ReviewMark, BuildMark, VersionMark)
• Documentation scaffolding (docs/): Build notes, guide, justifications, quality, requirements, review plan/report, trace matrix
• Source + tests: DemoClass.cs with XML docs; DemoClassTests.cs with AAA-pattern coverage
• Repo files: README.md, AGENTS.md, CONTRIBUTING.md, CODE_OF_CONDUCT.md, SECURITY.md, LICENSE, .gitignore, TemplateDotNetLibrary.slnx

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

Before submitting this pull request, ensure you have completed the following:

Build and Test

• Code builds successfully: dotnet build --configuration Release
• All unit 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

Please run the following checks before submitting:

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

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

Foundational commit — all infrastructure, tooling, and code established in a single changeset.

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