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useLangGraphRuntime: Missing edit/regenerate support and stale message state

useLangGraphRuntime: Missing edit/regenerate support and stale message state: a task in LegoFlow-SWE (Harbor dataset). The useLangGraphRuntime hook currently does not provide a way for end-users to edit their past messages or regenerate the last assistant response. The UI buttons for these actions…

The task

The `useLangGraphRuntime` hook currently does not provide a way for end-users to edit their past messages or regenerate the last assistant response. The UI buttons for these actions remain hidden because the runtime has no concept of server-side checkpoints required by LangGraph forking.

Part of Lego-X/LegoFlow-SWE.