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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 #668

Job	Run time
openkal e2e (the scripts, on a runner that has llvm)	10m 18s
build 3 targets on windows	7m 54s
build 3 targets on linux	7m 26s
build 3 targets on macos	6m 9s
run 3 builds on windows	4s
run 3 builds on linux	13s
run 3 builds on macos	9s
	32m 13s