Orca 0.5.19 adds journaled file and conversation rewind
Orca 0.5.19 adds per-turn content-addressed file checkpoints, dry-run previews, journaled restore with rollback and pruning, conversation or summary rewind modes, a workspace-drift guard, typed rewind events and cumulative token and cost accounting.
Why it matters: Agent rollback becomes an inspectable operation rather than an informal request to undo work. File pre-images, previewable plans and durable rewind events give operators a concrete recovery and audit path after a bad turn.