batch-50: Step 3-4 source download from Guangzhou — 49/50 ok

Run on dev1 (Guangzhou) for the latency advantage. Walltime 3:41 vs
Singapore-estimated 1-2h (~30x speedup, mostly from image.lceda.cn
RTT going from 263ms to 2.6ms).

Pro 25:  24 ok + 1 fail (Super Dial 7f7565ef11 — Pro 2.x legacy
                          schematic/lists 401, separate cookie-perm issue)
         611 docs, 31 MB total
Std 25:  25 ok, 97 docs, 74 MB total
Combined: 49/50 success, 708 docs, 105 MB new disk usage

--max-source-mb 200 cap was not tripped; the 25 Pro candidates are all
under 10 MB, so the 481 MB X86-board outlier from the original sample
was not representative.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

data/raw/oshwhub/ae88c322aff74ad3b1e9d5c403dfc4d4/metadata.json

@@ -82,5 +82,34 @@
     "public": true,
     "publish": true,
     "skipped_files": []
-  }
+  },
+  "source_format": "easyeda-std",
+  "source_path": "source/",
+  "source_documents": [
+    {
+      "doc_uuid": "4e161124c6c142659e2c74ce0072b468",
+      "docType": 1,
+      "master": "4383ccf5bd8f421a9a6e310645d77c8c",
+      "path": "source/4e161124c6c142659e2c74ce0072b468.json",
+      "size": 163185,
+      "sha256": "9bcb437b55e18696048ec4b0719b007a9a6ce215a63ebd56cc2aeffe91297e5b"
+    },
+    {
+      "doc_uuid": "128e16aa71754adfad5d1735e8531101",
+      "docType": 3,
+      "master": "a2a9923e9e244e06827693729275c91e",
+      "path": "source/128e16aa71754adfad5d1735e8531101.json",
+      "size": 995481,
+      "sha256": "a46253416f2fbb53150da45a640e95de6fba9df90b0a19f39264e04459a743b8"
+    },
+    {
+      "doc_uuid": "8d8922b9e8a7418982149befe8c7c4cc",
+      "docType": 3,
+      "master": "5f59d096299d4067bb094d01c4fef232",
+      "path": "source/8d8922b9e8a7418982149befe8c7c4cc.json",
+      "size": 290493,
+      "sha256": "605dc68adef80ce1da53c6d7186eab990eacb59f5bc502e3691edbf4c1861287"
+    }
+  ],
+  "editor_version": "6.5.1"
 }