feat(review): surface graph freshness metadata #332

Job	Run time
Coverage (llvm-cov)	1m 18s
test (ubuntu-latest)	45s
cargo-deny (advisories + licenses)	19s
mutation	1m 40s
version	6s
test (macos-latest)	45s
test (windows-latest)	49s
lint	1m 9s
security	19s
	7m 10s

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