refactor: unify tool reason requirements

.opencode/tools/render_scada_analysis.ts

@@ -1,3 +1,4 @@
+import { optionalToolReason } from "../tool-reason.js";
 import { tool } from "../tool.js";
 
 import { executeFrontendAction } from "./frontend_action.js";
@@ -8,11 +9,7 @@ export default tool({
   description:
     "将已经完成分析并确定等级的 SCADA 点位结果高亮、编号并定位到前端地图。等级只能来自已完成的分析结论。",
   args: {
-    reason: tool.schema
-      .string()
-      .trim()
-      .min(1)
-      .describe("Why the completed SCADA analysis should be rendered on the map."),
+    reason: optionalToolReason,
     items: tool.schema
       .array(
         tool.schema.object({