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Migrated to .NET 10 SDK, added Copilot instructions and Repo Assist #26

Job	Run time
build (Release, windows-latest)	31s
build (Debug, macOS-latest)	29s
build-devcontainer	1m 16s
build (Debug, ubuntu-latest)	37s
build (Debug, windows-latest)	30s
build (Release, ubuntu-latest)	33s
build (Release, macOS-latest)	23s
	4m 19s