Apply semantic requirement IDs and documentation fixes from TemplateDotNetLibrary

[Copilot]

Mirrors recent improvements from the TemplateDotNetLibrary sister template, specifically the switch to semantic requirement IDs and a pair of documentation accuracy fixes.

Changes

requirements.yaml — Semantic requirement IDs

Replaces opaque numeric IDs (TMPL-CMD-001…TMPL-PLT-005) with self-documenting semantic IDs aligned with the library pattern:

Before	After
TMPL-CMD-001	Template-Cmd-Context
TMPL-CMD-002	Template-Cmd-Version
TMPL-CMD-003	Template-Cmd-Help
TMPL-CMD-004	Template-Cmd-Silent
TMPL-CMD-005	Template-Cmd-Validate
TMPL-CMD-006	Template-Cmd-Results
TMPL-CMD-007	Template-Cmd-Log
TMPL-CMD-008	Template-Cmd-ErrorOutput
TMPL-CMD-009	Template-Cmd-InvalidArgs
TMPL-CMD-010	Template-Cmd-ExitCode
TMPL-PLT-001…005	Template-Platform-Windows/Linux/Net8/Net9/Net10

CONTRIBUTING.md — Two accuracy fixes

• Assert.HasCount argument order: documented as (collection, expectedCount) but the MSTest v4 signature is (expectedCount, collection) — would produce broken tests if followed literally.
• Encoding: UTF-8 with BOM → UTF-8. The .editorconfig sets charset = utf-8 globally; the BOM wording was only correct for C# files and misleading everywhere else.

AGENTS.md — Encoding description

Same encoding fix: UTF-8+BOM → UTF-8, preventing agents from incorrectly adding BOMs to YAML/JSON/Markdown files.

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
• 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

Requirement IDs in test links within requirements.yaml do not affect test result matching — the linked test names are unchanged. No test files were modified.

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