executor: fix Claude rate-limit detection and prioritize Gemini when limited

Updated parseStream to detect 'rate_limit_event' and 'assistant' error:rate_limit messages from the Claude CLI. Updated Classifier to strongly prefer non-rate-limited agents. Added logging to Pool to track rate-limit status during classification.

1 files changed, 11 insertions, 0 deletions

diff --git a/internal/executor/claude.go b/internal/executor/claude.go
index d6d92cb..2faeff3 100644
--- a/internal/executor/claude.go
+++ b/internal/executor/claude.go
@@ -421,6 +421,17 @@ func parseStream(r io.Reader, w io.Writer, logger *slog.Logger) (float64, error)
 
 		msgType, _ := msg["type"].(string)
 		switch msgType {
+		case "rate_limit_event":
+			if info, ok := msg["rate_limit_info"].(map[string]interface{}); ok {
+				status, _ := info["status"].(string)
+				if status == "rejected" {
+					streamErr = fmt.Errorf("claude rate limit reached: %v", msg)
+				}
+			}
+		case "assistant":
+			if errStr, ok := msg["error"].(string); ok && errStr == "rate_limit" {
+				streamErr = fmt.Errorf("claude rate limit reached: %v", msg)
+			}
 		case "result":
 			if isErr, _ := msg["is_error"].(bool); isErr {
 				result, _ := msg["result"].(string)