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docs(plan): v3, the standing ecosystem plan #1403

Job	Run time
hermetic e2e (no host toolchain, container)	5m 27s
e2e 2/2 (linux x86_64, self-host)	13m 44s
e2e 1/2 (linux x86_64, self-host)	12m 42s
bare-metal e2e (riscv64-none-elf + cortex-m, qemu)	5m 51s
	37m 44s