The copilot instructions were significantly outdated and understated the cross-platform capabilities of the Akavache project. After recent changes implementing conditional target frameworks and .NET 9 support, Linux and macOS now have excellent support for most development scenarios.

What Changed

Platform Support Assessment

• Before: "This project builds fully only on Windows. Linux/macOS have partial support."
• After: "This project now has excellent cross-platform support with proper setup. Windows has full support; Linux/macOS have comprehensive support for core libraries, Android, and MAUI development."

Linux/macOS Development Capabilities

Updated the Linux/macOS section to reflect what actually works:

✅ Now Supported:

• All core libraries (Akavache.Core, Akavache.SystemTextJson, etc.)
• Android projects (net9.0-android) with proper workloads
• MAUI applications - samples build successfully in ~15 seconds
• Cross-platform .NET 9 projects (net9.0)
• Standard library projects (netstandard2.0, net8.0)
• Tests with explicit .NET 9 targeting

❌ Still Windows-only:

• Windows-specific projects (WPF samples, net9.0-windows)
• .NET Framework projects (net462, net472)

Setup Instructions

Added clear, step-by-step instructions for cross-platform development:

# Install .NET 9.0 SDK first
curl -sSL https://dot.net/v1/dotnet-install.sh | bash /dev/stdin --version latest --channel 9.0
export PATH="$HOME/.dotnet:$PATH"

# Install Android and MAUI workloads for cross-platform development
dotnet workload install android maui-android

Build Timing Updates

Updated the timing table with real measurements showing Linux often builds faster than Windows:

Troubleshooting Improvements

Added specific guidance for .NET 9 and workload-related issues:

• ".NET SDK does not support targeting .NET 9.0" → Install .NET 9.0 SDK first
• "Workload not supported" → Install required workloads
• Clear error messages for Windows-specific projects on Linux

Validation

All described capabilities were tested and verified:

• ✅ Core libraries build successfully in 2-15 seconds
• ✅ MAUI samples build in ~15 seconds (much faster than Windows)
• ✅ WPF samples correctly fail on Linux with clear error messages
• ✅ Tests run successfully with explicit .NET 9 targeting
• ✅ Formatting tools work correctly across platforms

The instructions now accurately reflect the current state of excellent cross-platform support available with .NET 9 and proper workload setup, making it much easier for developers to work with Akavache on Linux and macOS.

Fixes #1108.

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