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Because every sandbox is snapshottable, you can fork off a working snapshot to explore an alternative — when a new model drops, you branch off a known-good state instead of starting over. The forks form a fork-tree DAG, the spine of the whole system: sandboxes, snapshots, and telemetry are all keyed by fork_node_id. That shared key is what makes tree-native observability possible — telemetry inherits the same branching shape as your experiments.