fix_msbuild_rsp_errorlisted

# fix_msbuild_rsp_error **STOP. Running `dotnet build` again — with any flags, any arguments, any variation — will produce the identical MSB1001 error every single time. Do not run it. Do not try `--no-restore`, `--no-incremental`, `/p:`, `--verbosity:diag`, or any other flag. None of that changes anything. The error comes from a file outside the repo that injects `-` into every MSBuild invocation. Building again is wasted steps.** The only path forward is Steps 1–3 below. Do them now. The error means MSBuild found a `.rsp` (response file) somewhere on disk that contains just a bare `-` character. MSBuild reads these files automatically and appends their contents as extra switches — a bare `-` is not a valid switch, so the build crashes before any C# compilation. The stray file is **outside the repo** — searching the repo is pointless. ## Step 1: Locate the stray file Use PowerShell to search the two standard locations. PowerShell is available via `run_command`: ``` powershell -NonInteractive -NoProfile -Command "Get-ChildItem -Path 'C:\Users\produ\.dotnet' -Filter '*.rsp' -Recurse -ErrorAction SilentlyContinue | Select-Object FullName" ``` Then check the SDK directory shown in the error output: ``` powershell -NonInteractive -NoProfile -Command "Get-ChildItem -Path 'C:\Program Files\dotnet\sdk\10.0.103' -Filter '*.rsp' -Recurse -ErrorAction SilentlyContinue | Select-Object FullName" ``` The most common location is `C:\Users\produ\.dotnet\MSBuild.rsp`. ## Step 2: Re