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/48dd1b650d084739bef92ab8a651975a/metadata.json

@@ -36,5 +36,42 @@
     "public": true,
     "publish": true,
     "skipped_files": []
-  }
+  },
+  "source_format": "easyeda-std",
+  "source_path": "source/",
+  "source_documents": [
+    {
+      "doc_uuid": "01c5c7c404e145d6b4448c8ac2484c35",
+      "docType": 1,
+      "master": "3047c7aa7bcd420ba6f17d2b3fe22bae",
+      "path": "source/01c5c7c404e145d6b4448c8ac2484c35.json",
+      "size": 359409,
+      "sha256": "609f11e73b4899f71d53aaffd1e31675f5bc81b39a7913e50b22ffa8e9aab994"
+    },
+    {
+      "doc_uuid": "e1a709b453c34ac49cc6b25b2ad03506",
+      "docType": 3,
+      "master": "80d0502ff0fe4242be4c6391732695c9",
+      "path": "source/e1a709b453c34ac49cc6b25b2ad03506.json",
+      "size": 1425065,
+      "sha256": "e4228e8beeba7ebc180fec7f466c09672bab1873b963e87635e87a8d3c74e16c"
+    },
+    {
+      "doc_uuid": "0f7a6585009947c59bf9205da9ea2859",
+      "docType": 3,
+      "master": "71570d074ba34620860f1cc1af273341",
+      "path": "source/0f7a6585009947c59bf9205da9ea2859.json",
+      "size": 205417,
+      "sha256": "8dbc8ccef6871e61918a442cf20ffaca1ba76623e2f7ed82642cbc85589cbf2a"
+    },
+    {
+      "doc_uuid": "b9f7badae6dd47079f8525c50769cafd",
+      "docType": 3,
+      "master": "f38f5e2333e04df7a816bd059693f232",
+      "path": "source/b9f7badae6dd47079f8525c50769cafd.json",
+      "size": 890166,
+      "sha256": "8e9783672ae9b630bbcb4c880d0e33a7e530e9e3be86849cdcb097d80e4d5f8e"
+    }
+  ],
+  "editor_version": "6.5.5"
 }