representing guardian review timeouts in protocol types (#17381)

## Summary

- Add `TimedOut` to Guardian/review carrier types:
  - `ReviewDecision::TimedOut`
  - `GuardianAssessmentStatus::TimedOut`
  - app-server v2 `GuardianApprovalReviewStatus::TimedOut`
- Regenerate app-server JSON/TypeScript schemas for the new wire shape.
- Wire the new status through core/app-server/TUI mappings with
conservative fail-closed handling.
- Keep `TimedOut` non-user-selectable in the approval UI.

**Does not change runtime behavior yet; emitting `TimeOut` and
parent-model timeout messaging will come in followup PRs**

codex-rs/protocol/src/protocol.rs

@@ -3494,6 +3494,9 @@ pub enum ReviewDecision {
     #[default]
     Denied,
 
+    /// Automatic approval review timed out before reaching a decision.
+    TimedOut,
+
     /// User has denied this command and the agent should not do anything until
     /// the user's next command.
     Abort,
@@ -3514,6 +3517,7 @@ impl ReviewDecision {
                 NetworkPolicyRuleAction::Deny => "denied_with_network_policy_deny",
             },
             ReviewDecision::Denied => "denied",
+            ReviewDecision::TimedOut => "timed_out",
             ReviewDecision::Abort => "abort",
         }
     }