Overhaul roadmap system for continuous autonomous iteration #45

Job	Run time
test-linux	1m 26s
test-macos	38s
cross-compile (x86_64-linux-gnu)	2m 11s
cross-compile (aarch64-linux-gnu)	2m 3s
cross-compile (x86_64-macos-none)	19s
cross-compile (aarch64-macos-none)	1m 59s
	8m 36s

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