cron: infer payload kind for model-only update patches (openclaw#15664) thanks @rodrigouroz

Verified:
- pnpm install --frozen-lockfile
- pnpm build
- pnpm check (fails on current origin/main in src/memory/embedding-manager.test-harness.ts; unchanged by this PR)

Co-authored-by: rodrigouroz <384037+rodrigouroz@users.noreply.github.com>
Co-authored-by: Tak Hoffman <781889+Takhoffman@users.noreply.github.com>

src/agents/pi-embedded-subscribe.handlers.tools.ts

@@ -75,12 +75,13 @@ export async function handleToolExecutionStart(
 
   if (toolName === "read") {
     const record = args && typeof args === "object" ? (args as Record<string, unknown>) : {};
-    const filePath =
+    const filePathValue =
       typeof record.path === "string"
-        ? record.path.trim()
+        ? record.path
         : typeof record.file_path === "string"
-          ? record.file_path.trim()
+          ? record.file_path
           : "";
+    const filePath = filePathValue.trim();
     if (!filePath) {
       const argsPreview = typeof args === "string" ? args.slice(0, 200) : undefined;
       ctx.log.warn(