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/4f06b185aae542eb94497acef0a9144b/metadata.json

@@ -73,5 +73,26 @@
     "public": true,
     "publish": true,
     "skipped_files": []
-  }
+  },
+  "source_format": "easyeda-std",
+  "source_path": "source/",
+  "source_documents": [
+    {
+      "doc_uuid": "afd634c145bf410c831a9c929e00a8a7",
+      "docType": 1,
+      "master": "dfeef411cf00418a8f8ac178a9a6df9b",
+      "path": "source/afd634c145bf410c831a9c929e00a8a7.json",
+      "size": 82757,
+      "sha256": "b2a164237ec3d6fd5ec00c8d41c8d4231d1e8643db3709f7770473fab6a5a369"
+    },
+    {
+      "doc_uuid": "2e3cded758d44f778856383ec136204b",
+      "docType": 3,
+      "master": "dab2885f088248c4ab4f366291b137fb",
+      "path": "source/2e3cded758d44f778856383ec136204b.json",
+      "size": 356185,
+      "sha256": "fb136e1c313d0778ff5befda94bc2cd86eae56820e2c939a8616811412bf8b76"
+    }
+  ],
+  "editor_version": "6.4.25"
 }