fix: retain cut in pending_cuts for re-proposals #111
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Fixes DAG cut height synchronization issue where consensus would fail waiting for a cut that had already been consumed.
Problem:
build_value()usedpending.remove(&height)which consumed the cut. When consensus moved to a new round and requested the same height again, the cut was gone.Solution: Changed to
pending.get(&height).cloned()to retain the cut for potential re-proposals. Retention logic handles cleanup.