refactor(utils): share safe json stringify

src/agents/cache-trace.ts

@@ -6,6 +6,7 @@ import type { OpenClawConfig } from "../config/config.js";
 import { resolveStateDir } from "../config/paths.js";
 import { resolveUserPath } from "../utils.js";
 import { parseBooleanValue } from "../utils/boolean.js";
+import { safeJsonStringify } from "../utils/safe-json.js";
 
 export type CacheTraceStage =
   | "session:loaded"
@@ -179,28 +180,6 @@ function summarizeMessages(messages: AgentMessage[]): {
   };
 }
 
-function safeJsonStringify(value: unknown): string | null {
-  try {
-    return JSON.stringify(value, (_key, val) => {
-      if (typeof val === "bigint") {
-        return val.toString();
-      }
-      if (typeof val === "function") {
-        return "[Function]";
-      }
-      if (val instanceof Error) {
-        return { name: val.name, message: val.message, stack: val.stack };
-      }
-      if (val instanceof Uint8Array) {
-        return { type: "Uint8Array", data: Buffer.from(val).toString("base64") };
-      }
-      return val;
-    });
-  } catch {
-    return null;
-  }
-}
-
 export function createCacheTrace(params: CacheTraceInit): CacheTrace | null {
   const cfg = resolveCacheTraceConfig(params);
   if (!cfg.enabled) {