Apply changes from TemplateDotNetLibrary PRs #30, #31, #32

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Syncs three improvements from the sister TemplateDotNetLibrary template (PRs #30, #31, #32).

Description

Add question issue template (#30)

• New .github/ISSUE_TEMPLATE/question.yml — structured form for usage/help questions with fields for question, what was tried, expected outcome, tool version, .NET version, and additional context

Add macOS platform support (#31)

• build.yaml: adds macos-latest to both build and integration-test OS matrices; simplifies OS_SHORT to sed 's/-latest//' (yields windows, ubuntu, macos uniformly)
• requirements.yaml: new Template-Platform-MacOS requirement linked to macos@TemplateTool_VersionDisplay / macos@TemplateTool_HelpDisplay; adds macos@ to source-filter docs
• README.md, AGENTS.md: "Windows and Linux" → "Windows, Linux, and macOS" throughout

Add Agent Selection Guide to AGENTS.md (#32)

• New bullet-list section mapping 9 common activities to the appropriate specialized agent (e.g. fix a bug → Software Developer, propagate template changes → Repo Consistency Agent)

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 unit tests pass: dotnet test --configuration Release
• Self-validation tests pass:
  dotnet run --project src/DemaConsulting.TemplateDotNetTool --configuration Release --framework net10.0
--no-build -- --validate
• 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 .

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

No code or unit-test changes — CI config, requirements, and documentation only. macOS CI evidence will be collected once the workflow runs on the new runner.

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Pull request overview

Syncs repository infrastructure updates from the TemplateDotNetLibrary template, focused on adding a “Question/Help” issue form and expanding CI/requirements/docs to explicitly support macOS.

Changes:

• Added a GitHub issue form for usage/help questions.
• Expanded CI build + integration-test matrices to include macos-latest and normalized OS_SHORT derivation.
• Updated requirements and documentation to include macOS platform support and added an agent selection guide.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
requirements.yaml	Adds macos@ source filter documentation and a new macOS platform requirement with evidence links.
README.md	Updates feature list to reflect macOS support.
AGENTS.md	Adds an Agent Selection Guide and updates platform/source-filter docs to include macOS.
.github/workflows/build.yaml	Adds macos-latest to build/integration-test matrices and simplifies OS short-name generation.
.github/ISSUE_TEMPLATE/question.yml	Introduces a structured Question/Help issue template.

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