Owen Lin bcdc695877 Track inherited paginated rollout prefixes (#33930) ...

## What changed

- Add `HistoryPosition` to identify a source thread and an exclusive rollout
  prefix by ordinal and JSONL byte offset.
- Add optional `history_base` metadata to `SessionMeta` so a thread can record
  an inherited prefix of another paginated rollout.
- Default missing `history_base` metadata to `None` and omit it when unset to
  preserve compatibility with existing rollout metadata.

## Testing

- Verify that legacy session metadata without `history_base` deserializes with
  no inherited history position.

GitOrigin-RevId: 3b2b07a2dfee793d3b37b0a60529f856f167dbc1

2026-07-18 00:06:49 +00:00

..

common

Track inherited paginated rollout prefixes (#33930)

2026-07-18 00:06:49 +00:00

suite

Track inherited paginated rollout prefixes (#33930)

2026-07-18 00:06:49 +00:00

all.rs

[codex] Use expect in integration tests (#28441)

2026-06-15 21:53:47 -07:00