perf(hive-claude): match rate-limit markers on raw line, drop re-serialize

hive-claude/src/classify.rs

@@ -65,12 +65,13 @@ impl Sentinels {
         }
     }
 
-    /// Trust a rate-limit hit on a JSON `error` event's serialized form.
-    pub(crate) fn scan_stdout_json(&self, event: &serde_json::Value) {
+    /// Trust a rate-limit hit only on a JSON `error` event (so a model
+    /// *discussing* a rate limit in prose can't trigger it). The `type` gate
+    /// needs the parsed `event`; the marker match runs on `raw`, the original
+    /// line — the same bytes, so we don't re-serialize the value.
+    pub(crate) fn scan_stdout_json(&self, event: &serde_json::Value, raw: &str) {
         if event.get("type").and_then(|t| t.as_str()) == Some("error")
-            && RATE_LIMIT_MARKERS
-                .iter()
-                .any(|m| event.to_string().contains(m))
+            && RATE_LIMIT_MARKERS.iter().any(|m| raw.contains(m))
         {
             self.rate_limited.store(true, Ordering::Relaxed);
         }

hive-claude/src/driver.rs

@@ -151,7 +151,7 @@ async fn pump_stdout(stdout: ChildStdout, sink: &impl Sink, sentinels: &Sentinel
     while let Ok(Some(line)) = lines.next_line().await {
         sentinels.scan_line(&line);
         if let Ok(event) = serde_json::from_str::<serde_json::Value>(&line) {
-            sentinels.scan_stdout_json(&event);
+            sentinels.scan_stdout_json(&event, &line);
             sink.on_event(&event);
         } else {
             sentinels.scan_rate_limit_text(&line);