jas88 / filestats / 19212743725

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Migrate to System.CommandLine (#329)

* Fix repository conformance issues

Add missing configuration files and standards compliance:

- Add Directory.Build.props with TreatWarningsAsErrors, AnalysisLevel, EnforceCodeStyleInBuild
- Enable Central Package Management with Directory.Packages.props
- Add CHANGELOG.md following Keep a Changelog format
- Add PACKAGES.md with NuGet package risk assessment
- Add dotnet-sdk ecosystem to dependabot.yml for SDK updates
- Add GitHub issue/PR templates and CODEOWNERS
- Add pre-commit hooks configuration
- Update .csproj files to use centralized package versions

All changes improve code quality, consistency, and automated dependency management.

* Update workflow to use .NET SDK from global.json

- Remove framework matrix (net6.0, net8.0)
- Use global-json-file parameter in setup-dotnet@v4
- Remove --framework flags from build/test commands
- Simplify matrix to OS only
- Project uses net$(NETCoreAppMaximumVersion) which resolves to SDK version

* Migrate from CommandLineParser to System.CommandLine

Replace attribute-based CommandLineParser with Microsoft's System.CommandLine.
Provides better async support, shell completions, and official Microsoft backing.

- Remove CommandLineParser package dependency
- Add System.CommandLine 2.0.0-beta5 package
- Rewrite Main() to use RootCommand and Option<T> API
- Remove JetBrains.Annotations usage from FileStats.cs (no longer needed)
- Maintain same CLI interface and behavior

* Remove JetBrains.Annotations package

JetBrains.Annotations was only used for [UsedImplicitly] attributes
on CommandLineParser options. With the migration to System.CommandLine,
these attributes are no longer needed since System.CommandLine doesn't
use reflection for option binding.

- Remove from filestats.csproj
- Remove from Directory.Packages.props
- Update PACKAGES.md documentation
- Reduce total package count from 11 to 10

* Update test for System.CommandLine error messages

System.CommandLine ... (continued)

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