Won Park 46142c3cb0 Rebrand approvals reviewer config to auto-review (#18504) ...

### Why

Auto-review is the user-facing name for the approvals reviewer, but the
config/API value still exposed the old `guardian_subagent` name. That
made new configs and generated schemas point users at Guardian
terminology even though the intended product surface is Auto-review.

This PR updates the external `approvals_reviewer` value while preserving
compatibility for existing configs and clients.

### What changed

- Makes `auto_review` the canonical serialized value for
`approvals_reviewer`.
- Keeps `guardian_subagent` accepted as a legacy alias.
- Keeps `user` accepted and serialized as `user`.
- Updates generated config and app-server schemas so
`approvals_reviewer` includes:
  - `user`
  - `auto_review`
  - `guardian_subagent`
- Updates app-server README docs for the reviewer value.
- Updates analytics and config requirements tests for the canonical
auto_review value.


### Compatibility

Existing configs and API payloads using:

```toml
approvals_reviewer = "guardian_subagent"
```

continue to load and map to the Auto-review reviewer behavior. 

New serialization emits: 
```toml
approvals_reviewer = "auto_review" 
```

This PR intentionally does not rename the [features].guardian_approval
key or broad internal Guardian symbols. Those are split out for a
follow-up PR to keep this migration small and avoid touching large
TUI/internal surfaces.

**Verification**
cargo test -p codex-protocol
approvals_reviewer_serializes_auto_review_and_accepts_legacy_guardian_subagent
cargo test -p codex-app-server-protocol
approvals_reviewer_serializes_auto_review_and_accepts_legacy_guardian_subagent

2026-04-22 15:45:35 -07:00

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