Upgrade to .NET 10 and add Codespaces/CI support

[Copilot]

Modernizes the project from .NET Framework 4.6 to .NET 10 and adds developer infrastructure for GitHub Codespaces and automated builds.

Changes

Project upgrade

• Converted to SDK-style project targeting net10.0
• Removed App.config and Properties/AssemblyInfo.cs (obsolete in modern .NET)

Developer infrastructure

• .devcontainer/devcontainer.json - Codespaces support with .NET 10 container, C# tooling, and GitHub CLI
• .github/workflows/build.yml - CI pipeline that builds and smoke-tests the application
• .gitignore - Added *_fixed.tcx pattern for output files

Example

Old project file (64 lines of XML):

<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="...">
  <PropertyGroup>
    <TargetFrameworkVersion>v4.6</TargetFrameworkVersion>
    <!-- ... -->
  </PropertyGroup>
  <ItemGroup>
    <Reference Include="System" />
    <!-- ... -->
  </ItemGroup>
  <!-- ... -->
</Project>

New project file (16 lines):

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net10.0</TargetFramework>
  </PropertyGroup>
  <ItemGroup>
    <None Update="powerData.tcx">
      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
    </None>
  </ItemGroup>
</Project>

No functional changes to application code.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Upgrade to net10 and modem flow</issue_title>
<issue_description>This is an old project, I want to start working on it again.
Can you upgrade to net10?
Also pls add support for code spaces and GitHub workflow</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Upgrade to net10 and modem flow #3

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[Copilot]

Pull request overview

This PR modernizes the VirtualSpeed project from .NET Framework 4.6 to .NET 10, converting it to a modern SDK-style project format and adding developer infrastructure for GitHub Codespaces and CI/CD. The changes significantly simplify the project structure while maintaining all existing functionality.

Changes:

• Converted project to SDK-style format targeting .NET 10, reducing project file from 64 to 16 lines
• Added GitHub Actions CI workflow with build and smoke test validation
• Added Codespaces support with pre-configured .NET development container

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
VirtualSpeed/VirtualSpeed/VirtualSpeed.csproj	Converted to modern SDK-style project format targeting net10.0 with simplified configuration
VirtualSpeed/VirtualSpeed/Properties/AssemblyInfo.cs	Removed obsolete assembly info file (not needed in SDK-style projects)
VirtualSpeed/VirtualSpeed/App.config	Removed obsolete configuration file (not needed in modern .NET)
.gitignore	Added pattern to ignore *_fixed.tcx output files generated by the application
.github/workflows/build.yml	Added CI pipeline that builds solution and runs smoke test to verify output file generation
.devcontainer/devcontainer.json	Added Codespaces configuration with .NET 10 container and C# development extensions

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