feat(git): workspace turn checkpointing via git shadow refs for safe rollback - #635
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cagdasyurekli wants to merge 2 commits into
Open
cagdasyurekli wants to merge 2 commits into
cagdasyurekli wants to merge 2 commits into
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Closes #614
Changes
Capture the working tree before the first local write in a turn and expose revert_turn for rollback. Store working-tree and staging snapshots in paired shadow refs, leaving HEAD and the real index unchanged during capture.
Restore uses NUL-delimited Git filenames, preserving Unicode, tabs and newlines, and restores the checkpoint's staged/unstaged split. It removes only extra nonignored files identified by Git and prunes empty directories. Snapshot creation publishes both refs in one transaction and refuses to overwrite an existing turn; resumed engines continue checkpoint numbering.
Checkpoint operations require the workspace to be the Git repository root. Subdirectory workspaces and legacy checkpoints without a staging snapshot fail closed rather than restoring a partial repository or guessing the index state.
Verification
pytest tests -q— 1,966 passed, 1 skipped (macOS, Python 3.14).