test: retry transient phase3 PDA requests

scripts/admin-test-env-modules/phase3-loading.mjs

@@ -74,6 +74,7 @@ export function stableLoadedCartonMarks(items) {
 }
 
 async function request(context, method, path, body, headers = {}) {
+  for (let attempt = 1; attempt <= 3; attempt += 1) {
     try {
       const response = await fetch(`${context.options.gateway}${path}`, {
       method,
@@ -84,7 +85,11 @@ async function request(context, method, path, body, headers = {}) {
       try { payload = raw ? JSON.parse(raw) : null } catch { /* bounded raw evidence */ }
       return { method, path, http: response.status, body: payload, raw: payload === null ? raw.slice(0, 500) : null,
         requestId: payload?.requestId || response.headers.get('x-request-id'), traceId: payload?.traceId || response.headers.get('x-trace-id') }
-  } catch (error) { return { method, path, http: 0, body: null, raw: String(error), requestId: null, traceId: null } }
+    } catch (error) {
+      if (attempt === 3) return { method, path, http: 0, body: null, raw: String(error), requestId: null, traceId: null }
+      await new Promise((resolve) => setTimeout(resolve, 250 * attempt))
+    }
+  }
 }
 
 export async function uploadEvidence(context, taskId, warehouseId, evidenceType, expectedVersion, keySuffix,