Add AGENTS instructions and updates

wanshenmean

2026-03-12 f56441867f2cc77567f97a92348a5d878f0dca05

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<Project Sdk="Microsoft.NET.Sdk">
 
  <PropertyGroup>
    <TargetFramework>net6.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>
 
</Project>