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perf(pages): emit a compact route manifest #2337

Job	Run time
test (ubuntu-latest, 1/2)	2m 53s
test (ubuntu-latest, unit)	2m 44s
build and typecheck (ubuntu-latest)	1m 58s
test (ubuntu-latest, 2/2)	2m 47s
live-e2e	0s
done	2s
	10m 24s