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/ce949d32c86f448398bd5fdbeb026a77/metadata.json

@@ -46,5 +46,26 @@
     "public": true,
     "publish": true,
     "skipped_files": []
-  }
+  },
+  "source_format": "easyeda-std",
+  "source_path": "source/",
+  "source_documents": [
+    {
+      "doc_uuid": "c69f9634ad5d4dffb5ea5ae478ba80c5",
+      "docType": 1,
+      "master": "eafbc06ac0d64909bb328aeb6e784138",
+      "path": "source/c69f9634ad5d4dffb5ea5ae478ba80c5.json",
+      "size": 240455,
+      "sha256": "a623d5919184f69526174b79cb531076069636bad5503dfaf5a87a67664f80f4"
+    },
+    {
+      "doc_uuid": "51ca1c31b74c4e2689e478d68c70b557",
+      "docType": 3,
+      "master": "dcc4c8252efb42e4a04a5e34ea862391",
+      "path": "source/51ca1c31b74c4e2689e478d68c70b557.json",
+      "size": 1466339,
+      "sha256": "78a6ab1853988b12f2aa4df25505543a10f41639bc38f3f068b25d25d79b6b2a"
+    }
+  ],
+  "editor_version": "6.5.51"
 }