feat: extract window.context.result.data for structured logistics data

Poll window.context.result.data (up to 15s) for productPackInfo,
productTitle, productAttributes, and skuSelection. This provides
structured weight/size/volume data per-variant directly from 1688's
JS context — more reliable than vision-only extraction.

Screenshots still captured as fallback for data only in images.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/index.ts

@@ -9,6 +9,8 @@ export interface ScrapeResult {
   command: Command;
   dryRun: boolean;
   offerId: string;
+  productPackInfo?: unknown;
+  windowContext?: unknown;
   screenshots?: string[];
   detailImages?: string[];
   error?: string;
@@ -202,8 +204,37 @@ export async function run(
 
     await cdp.send('Page.navigate', { url });
 
-    // Wait for page load + dynamic content
+    // Wait for window.context.result.data to be populated (poll up to 15s)
-    await new Promise(r => setTimeout(r, 5000));
+    let productPackInfo: unknown = null;
+    let windowContext: unknown = null;
+    for (let i = 0; i < 30; i++) {
+      await new Promise(r => setTimeout(r, 500));
+      const ctx = await cdp.evaluate(`
+        (function() {
+          try {
+            const d = window.context && window.context.result && window.context.result.data;
+            if (d && d.productPackInfo) {
+              return JSON.stringify({
+                productPackInfo: d.productPackInfo,
+                productTitle: d.productTitle || null,
+                productAttributes: d.productAttributes || null,
+                skuSelection: d.skuSelection || null,
+              });
+            }
+          } catch(e) {}
+          return null;
+        })()
+      `);
+      if (ctx) {
+        const parsed = JSON.parse(ctx);
+        productPackInfo = parsed.productPackInfo;
+        windowContext = parsed;
+        break;
+      }
+    }
+
+    // Extra wait for remaining dynamic content (images etc)
+    await new Promise(r => setTimeout(r, 2000));
 
     const outputDir = path.join('/tmp', '1688-logistics', offerId);
 
@@ -217,6 +248,8 @@ export async function run(
 
     return {
       status: 'success', url, command, dryRun, offerId,
+      productPackInfo,
+      windowContext,
       screenshots,
       detailImages,
     };