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Simplify setup docs and run first-use CI from README (#92) #15

Job	Run time
Published d2x install route (main only)	1m 43s
fresh (windows-2025, cold, MSVC=false)	2m 36s
fresh (Linux without a compiler, readme)	2m 3s
fresh (macos-14, readme, MSVC=true)	1m 16s
fresh (Linux without a compiler, cold)	1m 42s
fresh (windows-2022, cold, MSVC=true)	2m 18s
fresh (macos-14, cold, MSVC=true)	1m 9s
fresh (windows-2025, cold, MSVC=true)	2m 40s
fresh (windows-2025, readme, MSVC=false)	2m 37s
fresh (windows-2025, readme, MSVC=true)	2m 21s
fresh (windows-2022, readme, MSVC=true)	2m 21s
	22m 46s