fix

apps/api/internal/processing/llm_json_test.go

@@ -109,11 +109,23 @@ func TestCompleteJSON_returnsRetryError(t *testing.T) {
 }
 
 func TestProductEnhanceUser_truncates(t *testing.T) {
-	long := strings.Repeat("x", 2000)
+	long := strings.Repeat("x", MaxProductDescRunes+500)
 	u := ProductEnhanceUser("Cat", "Name", long, map[string]any{"brand": "B"})
-	if len([]rune(u)) > 900 {
+	// Category/Name/Attrs overhead + MaxProductDescRunes of description.
+	if len([]rune(u)) > MaxProductDescRunes+200 {
 		t.Fatalf("user too long: %d", len([]rune(u)))
 	}
+	descIdx := strings.Index(u, "Description: ")
+	if descIdx < 0 {
+		t.Fatalf("missing Description: in %q", u)
+	}
+	descPart := u[descIdx+len("Description: "):]
+	if i := strings.Index(descPart, "\n"); i >= 0 {
+		descPart = descPart[:i]
+	}
+	if len([]rune(descPart)) > MaxProductDescRunes {
+		t.Fatalf("description runes=%d want <= %d", len([]rune(descPart)), MaxProductDescRunes)
+	}
 	if !strings.Contains(u, "brand") {
 		t.Fatalf("%s", u)
 	}