Thank you for sharing! That did occur to me. ThoughtDAG now marks affected downstream answers as needing updates after an upstream node is modified, allowing users to rerun the algorithm in dependency order; alternatively, automatic refresh can be enabled only for specific nodes.

I didn't rebuild the entire tree by default, mainly because modifying earlier nodes might trigger a large number of calls and could overwrite some still valuable intermediate results. Older answers are retained as historical versions for easy comparison.