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Dylan Hurd c9b19deb09 Distinguish Guardian review threads from subagents (#40221)
## Why

Guardian reviews were reported with the generic `subagent` thread source, making them indistinguishable from other delegated threads in persisted metadata and analytics.

## What changed

- Add the `guardian_review` thread source to the core protocol and app-server schema.
- Assign it to Guardian reviewer sessions and propagate the configured source through turn metadata, rollouts, and analytics.
- Continue treating Guardian reviews like subagents for paginated history and trusted-provenance checks.

## Testing

- Cover protocol round trips, delegate source selection, emitted analytics, request metadata, and persisted rollout metadata.

GitOrigin-RevId: 07480c122715812874c9d3b48bb39fc5c86b2367
2026-08-23 10:06:57 +00:00
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2026-07-09 03:40:08 +00:00