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/929b16138f744f498c55840a87c141be/metadata.json

@@ -46,5 +46,34 @@
     "public": true,
     "publish": true,
     "skipped_files": []
-  }
+  },
+  "source_format": "easyeda-std",
+  "source_path": "source/",
+  "source_documents": [
+    {
+      "doc_uuid": "bca05ae082e94fa3a82b672ee09fe47a",
+      "docType": 1,
+      "master": "471e379a25554b0abb8373d3fe59044a",
+      "path": "source/bca05ae082e94fa3a82b672ee09fe47a.json",
+      "size": 346630,
+      "sha256": "6c8d7bbc579156adadfb85684d6cb3f583dbbce486c804a0b21292663990d7b0"
+    },
+    {
+      "doc_uuid": "df8206e58fef411bb9c56f580c07df34",
+      "docType": 3,
+      "master": "130d66d49694456d9a8fd7d7693209ad",
+      "path": "source/df8206e58fef411bb9c56f580c07df34.json",
+      "size": 1640407,
+      "sha256": "93eb3e57f0b7068de7b3a8d5015a405f4e9d83b6240fca3780b5c4f856fefbb2"
+    },
+    {
+      "doc_uuid": "4ed664223f7342658c04c10f5666207f",
+      "docType": 3,
+      "master": "1242605f824440cb9c85370b5d2e3aa0",
+      "path": "source/4ed664223f7342658c04c10f5666207f.json",
+      "size": 300148,
+      "sha256": "3f02a13b7c7fe2ffc4c01228757ae332e566c5439d2924d7b4ceaf90f47bd76e"
+    }
+  ],
+  "editor_version": "6.5.20"
 }