Bring in recent changes from TemplateDotNetTool (PRs #53, #54, #55)

[Copilot]

Syncs SonarMark with three recent TemplateDotNetTool template PRs.

PR #53 — Continuous Compliance documentation

• README.md: Added Linting Enforcement, Continuous Compliance, and Requirements Traceability feature bullets; added [link-continuous-compliance] reference
• docs/guide/guide.md: Added # Continuous Compliance section (key practices: traceability, linting, audit docs, CodeQL/SonarCloud) between Introduction and Installation; added link reference

PR #54 — macOS support + Agent Selection Guide

• .github/ISSUE_TEMPLATE/question.yml: New question/help issue template
• .github/workflows/build.yaml: Added macos-latest to build and integration-test matrices; simplified OS_SHORT sed to s/-latest// (produces windows, ubuntu, macos instead of win, ubuntu)
• AGENTS.md: Added ## Agent Selection Guide (task-to-agent routing); added macos@TestName source filter entry
• requirements.yaml: Added macos@TestName source filter comment; added SonarMark-Plt-MacOS requirement with matching test evidence

PR #55 — CodeQL build-mode

• .github/workflows/build.yaml: Added build-mode: manual to Initialize CodeQL step

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

Related Issues

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 tests pass: dotnet test --configuration Release
• Self-validation tests pass:
  dotnet run --project src/DemaConsulting.SonarMark --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

Linting

• Markdown linter passes: npx markdownlint-cli2 "**/*.md" "#node_modules"
• Spell checker passes: npx cspell "**/*.{md,cs}" --no-progress
• 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 production code changes — CI/CD workflow, documentation, and requirements traceability only.

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