Fuse v5 speeds up dotnet build up to 7.4x for AI agents

Fuse 5 is a .NET tool that keeps a solution loaded in the background and answers agent checks up to 7.4x faster than dotnet build and 5.7x faster than dotnet test. It reports only errors introduced by an edit and runs only affected tests.

• Edit checks up to 7.4x faster than dotnet build on Community Toolkit
• Affected tests up to 5.7x faster than dotnet test on Community Toolkit
• Reports only introduced errors, capped at 20 errors or 10 test failures
• Engine keeps projects in memory: 271 MB to 2,429 MB in benchmarks