Fix repo-consistency agent fetching oldest PRs instead of most recently merged

[Copilot]

Pull Request

Description

The repo-consistency agent was fetching the 20 oldest merged PRs due to GitHub's search API defaulting to ascending order when no sort is specified. Ports the fix from TemplateDotNetLibrary#65.

Change in .github/agents/repo-consistency.agent.md:

-1. Fetch the last 20 merged PRs (`is:pr is:merged`) from ...
+1. Fetch the 20 most recently merged PRs (`is:pr is:merged sort:updated-desc`) from ...

sort:updated-desc is the best available proxy for merge recency since GitHub's search API has no sort:merged qualifier — merging a PR always updates its updated_at timestamp.

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 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

Please run the following checks before submitting:

• All linters pass: ./lint.sh (Unix/macOS) or cmd /c lint.bat / ./lint.bat (Windows)

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

Agent-only file change; no build, test, or code artifacts affected.

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[Copilot]

Pull request overview

Updates the repo-consistency agent instructions to ensure it analyzes recent template changes by fetching the most recently merged PRs rather than the oldest merged PRs (caused by GitHub search default sort behavior).

Changes:

• Update the GitHub search query in the agent instructions to include sort:updated-desc.
• Clarify the step wording to explicitly state “20 most recently merged PRs”.

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