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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 #2365

Job	Run time
toolchains + regressions (windows x64)	16m 19s
build + test + package (windows x64, self-host)	12m 54s
bare Windows: no Visual Studio (windows x64)	3m 4s
	32m 17s