- Reflect that checkpoints are now enabled by default
- Document /rollback diff <N> for previewing changes
- Document /rollback <N> <file> for single-file restore
- Document automatic conversation undo on rollback
- Document terminal command checkpoint coverage
- Update listing example to show change stats
- Fix config path (checkpoints.enabled, not agent.checkpoints_enabled)
- Consolidate features/checkpoints.md to brief summary with link
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