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Introduce a lightweight checkpoint/rollback system for sandbox state during plan execute and apply flows. CheckpointManager snapshots the sandbox working directory before each phase and can restore it on failure, giving the execution engine a reliable undo mechanism. Key changes: - SandboxCheckpoint model, Checkpointable protocol, and CheckpointManager in infrastructure/sandbox/checkpoint.py - PlanExecutor gains optional checkpoint_manager with pre/post execute hooks and automatic rollback on failure - PlanApplyService gains optional checkpoint_manager with pre-apply checkpoint and rollback helper - 12 BDD scenarios (features/sandbox_checkpoints.feature) - 5 Robot Framework smoke tests (robot/sandbox_checkpoint_smoke.robot) - ASV benchmarks for creation, rollback, and listing operations - Reference documentation in docs/reference/sandbox.md ISSUES CLOSED: #183