Nuggets workflow audio: include failure reason in the error message; v2.17.2

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

server/routes/nuggets-workflow.js

@@ -139,7 +139,9 @@ export function register(app) {
       stream.pipe(res)
     } catch (err) {
       console.error('[nuggets-workflow] audio error:', err.message, err.cause?.message ?? '')
-      if (!res.headersSent) res.status(500).json({ message: 'Audio stream failed.' })
+      // Admin-only route, so the reason is safe to show and saves a trip to the server logs.
+      const reason = [err.message, err.cause?.message].filter(Boolean).join(': ')
+      if (!res.headersSent) res.status(500).json({ message: `Audio stream failed${reason ? ` (${reason})` : ''}.` })
     }
   })
 }