fixes

apps/api/internal/processing/ai_provider_mode.go

@@ -56,3 +56,26 @@ func normalizeProviderMode(label string) string {
 		return AIProviderUnknown
 	}
 }
+
+// isUnknownProviderMode reports empty or the sentinel "unknown" analytics label.
+func isUnknownProviderMode(label string) bool {
+	m := strings.ToLower(strings.TrimSpace(label))
+	return m == "" || m == AIProviderUnknown
+}
+
+// preferKnownProviderMode returns the first non-unknown label, else unknown.
+func preferKnownProviderMode(candidates ...string) string {
+	for _, c := range candidates {
+		if !isUnknownProviderMode(c) {
+			return normalizeProviderMode(c)
+		}
+	}
+	return AIProviderUnknown
+}
+
+func lastResultAIProviderMode(r *StepResult) string {
+	if r == nil {
+		return ""
+	}
+	return r.AIProviderMode
+}