release: v0.3.0 pub recent, quota warnings, richer 404 hints #10

Job	Run time
test	35s
cross-build-smoke (darwin, arm64)	26s
cross-build-smoke (linux, amd64)	27s
cross-build-smoke (windows, amd64)	28s
cross-build-smoke (linux, arm64)	15s
	2m 11s

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