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2026.9.29.1: a workspace is one graph per configuration; the planning regression of 2026.9.28.3 fixed at its cause #1896

Job	Run time
e2e 2/2 (linux x86_64, self-host)	25m 52s
e2e 1/2 (linux x86_64, self-host)	21m 59s
bare-metal e2e (riscv64-none-elf + cortex-m, qemu)	7m 38s
android e2e (NDK rows + x86_64 emulator)	12m 15s
hermetic e2e (no host toolchain, container)	12m 28s
	1h 20m 12s