[AIT-681] Compute fork metadata for edits via `useChat` #139

Job	Run time
check	1m 0s
build	40s
test-integration node 24	59s
demo demo/vercel/react/use-chat	1m 14s
test node 24	47s
demo demo/vercel/react/use-client-transport	1m 18s
test-integration node 22	1m 2s
test node 20	40s
test-integration node 20	1m 13s
test node 22	43s
	9m 36s

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