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Migrated to .NET 10 SDK, added Copilot instructions and Repo Assist #28

Job	Run time
build-devcontainer	1m 35s
build (Release, windows-latest)	1m 32s
build (Release, macOS-latest)	28s
build (Release, ubuntu-latest)	35s
build (Debug, macOS-latest)	21s
build (Debug, windows-latest)	1m 45s
build (Debug, ubuntu-latest)	31s
	6m 47s