docs: document why the graph is a computed snapshot, not a maintained… #58

Job	Run time
test	1m 25s
build (macos-latest, darwin, arm64)	1m 16s
build (ubuntu-24.04-arm, linux, arm64)	56s
build (windows-latest, windows, amd64)	5m 29s
build (macos-13, darwin, amd64)	1d 0h 0m 1s
build (ubuntu-latest, linux, amd64)	1m 12s
	1d 0h 10m 19s

Provide feedback