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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 #667

Job	Run time
build 3 targets on macos	4m 25s
openkal e2e (the scripts, on a runner that has llvm)	11m 8s
build 3 targets on linux	6m 15s
build 3 targets on windows	7m 46s
run 3 builds on macos	5s
run 3 builds on windows	4s
run 3 builds on linux	6s
	29m 49s