Add MSVC code coverage script and skill

[parth21999]

Summary

• Add run_coverage.ps1 to .github/scripts/ - a PowerShell script that runs MSVC code coverage using Microsoft.CodeCoverage.Console.exe (VS Enterprise), collects Cobertura XML, and displays per-file/per-function coverage with uncovered line ranges
• Add run-coverage skill to .github/skills/ - instructions for AI assistants on how to use the coverage script

Test plan

• Run script against a unit test executable and verify Cobertura XML output is generated
• Verify -SourceFilter wildcard patterns correctly filter source files
• Verify -ShowFunctions and -ShowUncoveredLines flags produce expected output
• Verify script errors gracefully when VS Enterprise is not available

🤖 Generated with Claude Code

[dcristoloveanu]

Have you looked if there is already a parser for the coverage? I have not looked, but it is a good idea to not reinvent and maintain if we can. #Resolved

[parth21999]

I looked at a few options. All the parsers generate extensive reports that then need to be parsed again to get the actual list of uncovered lines.

I think it's just better to get the info from the source of truth (cobertura report) than to generate another html/md report and parse that.

[dcristoloveanu]