feat(#2109): harness-side idle watchdog to bail on anthropic api stall storms

hive-ag3nt/src/serve_common.rs

@@ -98,6 +98,7 @@ pub fn build_row(args: TurnRowArgs<'_>) -> TurnStatRow {
         Err(TurnError::RateLimited) => ("rate_limited", None),
         Err(TurnError::AuthFailed) => ("auth_failed", None),
         Err(TurnError::SessionNotFound) => ("session_not_found", None),
+        Err(TurnError::ApiStall) => ("api_stall", None),
         Err(TurnError::Failed(e)) => ("failed", Some(format!("{e:#}"))),
     };
     let wake_from = if wake_from.starts_with("bash-task-") {