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/aa6f9628c70d4b208e10a6734cd0fc02/metadata.json

@@ -64,5 +64,26 @@
     "public": true,
     "publish": true,
     "skipped_files": []
-  }
+  },
+  "source_format": "easyeda-std",
+  "source_path": "source/",
+  "source_documents": [
+    {
+      "doc_uuid": "a5d88e7691b040ebb9611e70471f9a45",
+      "docType": 1,
+      "master": "c688e6098c5147369b254cdb16be7880",
+      "path": "source/a5d88e7691b040ebb9611e70471f9a45.json",
+      "size": 183654,
+      "sha256": "1fce6aa48fb432364672b65fe4ec12a35e7b4a40c6c5f9f5cd765cb211c59a1b"
+    },
+    {
+      "doc_uuid": "350028f8b8714f3497348ca894da908f",
+      "docType": 3,
+      "master": "7e642c02833f4b77bd1092a9bc2a3f9d",
+      "path": "source/350028f8b8714f3497348ca894da908f.json",
+      "size": 1023285,
+      "sha256": "a997fb0c77454c7244227cc728a94fcd3c895b7480891fe44c73e12c1ad6d0d8"
+    }
+  ],
+  "editor_version": "6.5.5"
 }