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2026.9.26.2: one compile database per configuration, emit plans every member, prepare actions and runtime search directories, DLLs beside a Windows program, link flags as words #2366

Job	Run time
build + test + package (windows x64, self-host)	13m 31s
toolchains + regressions (windows x64)	17m 30s
bare Windows: no Visual Studio (windows x64)	-1s
	31m 0s