fix(infra): treat nested network request errors as non-fatal

src/infra/unhandled-rejections.test.ts

@@ -92,6 +92,30 @@ describe("isTransientNetworkError", () => {
     expect(isTransientNetworkError(error)).toBe(true);
   });
 
+  it("returns true for Slack request errors that wrap network codes in .original", () => {
+    const error = Object.assign(new Error("A request error occurred: getaddrinfo EAI_AGAIN"), {
+      code: "slack_webapi_request_error",
+      original: {
+        errno: -3001,
+        code: "EAI_AGAIN",
+        syscall: "getaddrinfo",
+        hostname: "slack.com",
+      },
+    });
+    expect(isTransientNetworkError(error)).toBe(true);
+  });
+
+  it("returns true for network codes nested in .data payloads", () => {
+    const error = {
+      code: "slack_webapi_request_error",
+      message: "A request error occurred",
+      data: {
+        code: "EAI_AGAIN",
+      },
+    };
+    expect(isTransientNetworkError(error)).toBe(true);
+  });
+
   it("returns true for AggregateError containing network errors", () => {
     const networkError = Object.assign(new Error("timeout"), { code: "ETIMEDOUT" });
     const error = new AggregateError([networkError], "Multiple errors");
@@ -109,6 +133,18 @@ describe("isTransientNetworkError", () => {
     expect(isTransientNetworkError(error)).toBe(false);
   });
 
+  it("returns false for Slack request errors without network indicators", () => {
+    const error = Object.assign(new Error("A request error occurred"), {
+      code: "slack_webapi_request_error",
+    });
+    expect(isTransientNetworkError(error)).toBe(false);
+  });
+
+  it("returns false for non-transient undici codes that only appear in message text", () => {
+    const error = new Error("Request failed with UND_ERR_INVALID_ARG");
+    expect(isTransientNetworkError(error)).toBe(false);
+  });
+
   it.each([null, undefined, "string error", 42, { message: "plain object" }])(
     "returns false for non-network input %#",
     (value) => {