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/81e13f4b2c8942dca536bfe23e2bf1dc/metadata.json

@@ -109,5 +109,38 @@
     "public": true,
     "publish": true,
     "skipped_files": []
-  }
+  },
+  "source_format": "easyeda-pro-legacy",
+  "source_path": "source/",
+  "source_documents": [
+    {
+      "doc_uuid": "b1601eecf1cd488db0adafb3d15f6523",
+      "docType": 1,
+      "path": "source/b1601eecf1cd488db0adafb3d15f6523.json",
+      "size": 39401,
+      "sha256": "b85b87ebc922ca07fa8dbb00bfa5ab8010e315156dd5ee01fde7783397e279d3"
+    },
+    {
+      "doc_uuid": "db5afc9ff7f04ff7b72448077a3c27b5",
+      "docType": 1,
+      "path": "source/db5afc9ff7f04ff7b72448077a3c27b5.json",
+      "size": 86431,
+      "sha256": "857c94af9c63445460dfc01579079c10bd86f23f5d2de3aed0cb2aa92d1fc004"
+    },
+    {
+      "doc_uuid": "9533dd1a73ef4d3db9699bf1ee6b0b3a",
+      "docType": 1,
+      "path": "source/9533dd1a73ef4d3db9699bf1ee6b0b3a.json",
+      "size": 36078,
+      "sha256": "3387a93980ec1799877afd0ed5a482c44cbf2a22f92dd0678f55c2021e928f61"
+    },
+    {
+      "doc_uuid": "19504c9277084d459f2acd6ab5b234cf",
+      "docType": 3,
+      "path": "source/pcb_19504c9277084d459f2acd6ab5b234cf.json",
+      "size": 191454,
+      "sha256": "bd513a63b11ba9ca01216ef7e4caa97c0f33c77c9a54f0612e4c7bc533321ee9"
+    }
+  ],
+  "editor_version": "2.1.34"
 }