docs(plan): the four general build-infrastructure gaps #1439

Job	Run time
e2e 2/2 (linux x86_64, self-host)	15m 52s
bare-metal e2e (riscv64-none-elf + cortex-m, qemu)	5m 41s
e2e 1/2 (linux x86_64, self-host)	14m 34s
hermetic e2e (no host toolchain, container)	8m 41s
	44m 48s

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