Introduce GREP-393: Coherent updates#640

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unmarshall wants to merge 3 commits into

ai-dynamo:mainfrom

unmarshall:coherent-update-grep

Commits on Jun 1, 2026

docs(GREP-393): add Coherent rolling updates proposal
unmarshall
committed

Commits on Jun 5, 2026

docs(GREP-393): add gang termination suppression section and refine scale-block prose
unmarshall
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docs(GREP-393): address review comments on PGM readers and TPG phase condition
unmarshall
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