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2026.9.6.6: one package, one version — and a rule brings its own envi… #1455

Job	Run time
bare-metal e2e (riscv64-none-elf + cortex-m, qemu)	7m 7s
hermetic e2e (no host toolchain, container)	8m 40s
e2e 2/2 (linux x86_64, self-host)	17m 22s
e2e 1/2 (linux x86_64, self-host)	16m 55s
	50m 4s