The ledger cannot promise an item is never sent twice: a crash between a send and its sent line, or an owner removing that line, sends it again. A decided line holds a skip and its reason, as task 07's ledger does. Turns from before sync began are skipped (owner's decision, 2026-09-28). Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>