felixxia-oai 80d7ca34bc Retain user instructions in guardian thread context (#42762) ...

## Why

Guardian review needs the original user instructions alongside verified answers, even after compaction, resume, or rollback. A summarized or legacy checkpoint cannot establish a complete instruction history.

## What changed

- Capture text user messages in retained context when `guardian_thread_context` is enabled, preserving their message identity through compaction and replay.
- Keep retained instructions and verified answers in arrival order, with independent size and completeness tracking for each family.
- Roll back retained evidence at the exact user-message boundary, including steers that share a turn ID, and apply the same semantics during rollout migration.
- Treat checkpoints without retained user messages as incomplete while preserving their verified answers.

## Testing

- Cover capture, compaction, resume, rollback, child forks, legacy checkpoints, storage bounds, and rollout migration.

GitOrigin-RevId: 72706731b54e5ac8645db61b446d2401afb42235

2026-09-04 13:24:42 +00:00

..

src

Retain user instructions in guardian thread context (#42762)

2026-09-04 13:24:42 +00:00

BUILD.bazel

Add shared Guardian context primitives (#41392)

2026-08-28 19:02:26 +00:00

Cargo.toml

Persist verified user answers in Guardian thread context (#42579)

2026-09-03 16:41:11 +00:00