Module checkpoint_log 

Per-session log of turn-level checkpoint records.

Each session writes a checkpoints.jsonl file alongside its transcript. One line = one turn, capturing the pre/post checkpoint ids and the set of files this turn touched (via structured tool calls and/or fallback shell-diff).

This metadata is what recursive sessions rewind reads to:

1. find the right pre checkpoint to restore to,
2. compute the union of files touched in the rewound-away turns,
3. detect conflicts where the workspace’s current state diverges from this session’s last known post-snapshot.

Structs

CheckpointLogWriter

Append-only writer.

CheckpointRecord

One record per turn.

Enums

TouchedVia

Functions

read_log

Read all records from path. Empty / missing file → empty vec.

truncate_to_turn

Truncate the log to records with turn < cutoff. Atomic via temp file + rename.