Upgrade the solution to the .slnx format introduced in .NET 10.

Author: teklot

.github/workflows/build-and-test.yml

@@ -22,10 +22,10 @@ jobs:
         dotnet-version: 10.0.x
 
     - name: Restore dependencies
-      run: dotnet restore SignalBench.sln
+      run: dotnet restore SignalBench.slnx
 
     - name: Build
-      run: dotnet build SignalBench.sln --configuration Release --no-restore
+      run: dotnet build SignalBench.slnx --configuration Release --no-restore
 
     - name: Test
-      run: dotnet test SignalBench.sln --configuration Release --no-build --verbosity normal
+      run: dotnet test SignalBench.slnx --configuration Release --no-build --verbosity normal

README.md

@@ -138,7 +138,7 @@ Streaming settings are **per-workspace (per-tab)**. You can stream from multiple
 The project uses the modern .NET 10 artifacts layout. Build results are centralized in the `artifacts/` directory at the root of the solution.
 
 ```bash
-dotnet build SignalBench.sln
+dotnet build SignalBench.slnx
 ```
 
 ### Running Tests