Fix #4: remove global axios-retry side-effect; add dedicated downloadClient

- wxccRoutes.js no longer mutates the default axios instance, which was
  causing every bare axios call in the codebase (S3 downloads, Assets
  diagnostics) to inherit retries as a side-effect of route file load order.
- jiraService.js now defines a private downloadClient (own timeout, own
  retry policy) used by attachFileToJira and fetchAndConvertTranscript for
  fetching pre-signed S3 URLs.
- Assets AQL/GET remain bare axios calls; they're one-shot diagnostics
  and should not auto-retry.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/routes/wxccRoutes.js

@@ -1,22 +1,9 @@
 import express from 'express';
-import axios from 'axios';
-import axiosRetry from 'axios-retry';
 import { logger, webexLogger } from '../utilities/logger.js';
 import * as jiraService from '../services/jiraService.js';
 import grokService from '../services/grokService.js';
 import config from '../config/index.js';
 
-// Configure retry for transient failures
-axiosRetry(axios, {
-    retries: 3,
-    retryDelay: (retryCount) => Math.pow(2, retryCount) * 1000,
-    retryCondition: (error) => {
-        return axiosRetry.isNetworkOrIdempotentRequestError(error) ||
-               error.response?.status === 429 ||
-               error.response?.status >= 500;
-     }
-});
-
 const router = express.Router();
 
 // ========================

src/services/jiraService.js

@@ -30,9 +30,11 @@ const createJiraClient = () => {
         headers,
      });
 
-     // Apply retry policy to this instance (keep in sync with the global axios-retry
-     // configured in wxccRoutes.js for the S3 downloads and any other raw calls).
-     // Using exponential backoff to match the current policy in routes.
+    // Retry policy scoped to this client only. We used to also mutate the
+    // global axios instance from wxccRoutes.js, which caused every bare axios
+    // call (S3 downloads, Assets AQL, etc.) to inherit these retries as a
+    // side-effect. That's been removed — anything that needs retries now uses
+    // an explicit instance (jiraClient here, downloadClient below).
     axiosRetry(client, {
         retries: 3,
         retryDelay: (retryCount) => Math.pow(2, retryCount) * 1000,
@@ -48,6 +50,24 @@ const createJiraClient = () => {
 
 export const jiraClient = createJiraClient();
 
+// Dedicated instance for fetching pre-signed S3 URLs (audio + transcript
+// files that Webex CC hands us). Kept separate from jiraClient because:
+//   1. Different base URL (no baseURL — we always pass the full pre-signed URL).
+//   2. No Authorization header (the S3 URL is already signed).
+//   3. We want retries here — S3 pre-signed downloads are the flakiest thing
+//      in the pipeline (transient 5xx, TLS resets, TCP timeouts).
+// Kept private (not exported); callers in this module use it directly.
+const downloadClient = axios.create({ timeout: 20000 });
+axiosRetry(downloadClient, {
+    retries: 3,
+    retryDelay: (retryCount) => Math.pow(2, retryCount) * 1000,
+    retryCondition: (error) => {
+        return axiosRetry.isNetworkOrIdempotentRequestError(error) ||
+            error.response?.status === 429 ||
+            error.response?.status >= 500;
+    }
+});
+
 // ========================
 // Existing Functions (updated to use jiraClient where possible)
 // ========================
@@ -256,9 +276,8 @@ async function attachBufferToJira(jiraKey, fileBuffer, fileName) {
 export async function attachFileToJira(jiraKey, fileUrl, fileName) {
     let fileBuffer;
     try {
-        const dl = await axios.get(fileUrl, {
-            responseType: 'arraybuffer',
-            timeout: 20000
+        const dl = await downloadClient.get(fileUrl, {
+            responseType: 'arraybuffer'
         });
         fileBuffer = Buffer.from(dl.data);
     } catch (dlErr) {
@@ -308,7 +327,7 @@ function formatTranscriptToHumanReadable(data) {
 
 async function fetchAndConvertTranscript(url) {
     try {
-        const resp = await axios.get(url, { timeout: 10000 });
+        const resp = await downloadClient.get(url, { timeout: 10000 });
         return formatTranscriptToHumanReadable(resp.data);
     } catch (e) {
         logger.warn(`Failed to fetch/convert transcript: ${e.message}`);