fix(cron): treat transient tool error payloads as recoverable (openclaw#29527) thanks @Sid-Qin

Verified:
- pnpm install --frozen-lockfile
- pnpm check
- pnpm test -- --run src/cron/isolated-agent.uses-last-non-empty-agent-text-as.test.ts

Co-authored-by: Sid-Qin <201593046+Sid-Qin@users.noreply.github.com>
Co-authored-by: Tak Hoffman <781889+Takhoffman@users.noreply.github.com>

src/cron/isolated-agent.uses-last-non-empty-agent-text-as.test.ts

@@ -197,6 +197,50 @@ describe("runCronIsolatedAgentTurn", () => {
     });
   });
 
+  it("treats transient error payloads as non-fatal when a later success payload exists", async () => {
+    await withTempHome(async (home) => {
+      mockEmbeddedPayloads([
+        {
+          text: "⚠️ ✍️ Write: failed",
+          isError: true,
+        },
+        {
+          text: "Write completed successfully.",
+          isError: false,
+        },
+      ]);
+      const { res } = await runCronTurn(home, {
+        jobPayload: DEFAULT_AGENT_TURN_PAYLOAD,
+        mockTexts: null,
+      });
+
+      expect(res.status).toBe("ok");
+      expect(res.summary).toBe("Write completed successfully.");
+    });
+  });
+
+  it("keeps error status when run-level error accompanies post-error text", async () => {
+    await withTempHome(async (home) => {
+      vi.mocked(runEmbeddedPiAgent).mockResolvedValue({
+        payloads: [
+          { text: "Model context overflow", isError: true },
+          { text: "Partial assistant text before error" },
+        ],
+        meta: {
+          durationMs: 5,
+          agentMeta: { sessionId: "s", provider: "p", model: "m" },
+          error: { kind: "context_overflow", message: "exceeded context window" },
+        },
+      });
+      const { res } = await runCronTurn(home, {
+        jobPayload: DEFAULT_AGENT_TURN_PAYLOAD,
+        mockTexts: null,
+      });
+
+      expect(res.status).toBe("error");
+    });
+  });
+
   it("passes resolved agentDir to runEmbeddedPiAgent", async () => {
     await withTempHome(async (home) => {
       const { res } = await runCronTurn(home, {