What: Unlocked the file checkpointing ("Rewind") feature that allows reverting file changes to previous snapshots.
Details:
- Feature existed in previous versions but was hardcoded to disabled
- Now activatable via the
tengu_use_file_checkpointsfeature flag - UI toggle added in settings: "Checkpointing (Rewind)" (line 400220)
- Can be disabled via
CLAUDE_CODE_DISABLE_FILE_CHECKPOINTINGenvironment variable - Tracks file modifications and creates snapshots at message boundaries
- Enables rewinding files to previous states during conversations
- Disabled in headless mode
- Still behind a feature flag for gradual rollout
- Evidence: Activation function
u7()at line 380874, UI controls at lines 400220-400237