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/3e3c7725251c4456ad91cd88308944ff/metadata.json

@@ -109,5 +109,45 @@
     "public": true,
     "publish": true,
     "skipped_files": []
-  }
+  },
+  "source_format": "easyeda-pro-legacy",
+  "source_path": "source/",
+  "source_documents": [
+    {
+      "doc_uuid": "8fab799a374c486596746691b2398323",
+      "docType": 1,
+      "path": "source/8fab799a374c486596746691b2398323.json",
+      "size": 109355,
+      "sha256": "0796c6a8c3c6bbb5a477a13f97e7df3db3427132ad035983c30300cc8c6564ec"
+    },
+    {
+      "doc_uuid": "c07a4fc4317d467f9a88351ebcf0aed9",
+      "docType": 1,
+      "path": "source/c07a4fc4317d467f9a88351ebcf0aed9.json",
+      "size": 11990,
+      "sha256": "7adde313ff1e7104b6f5faeb0523a415102ddcb4717f75ded0a708e27d6e5c7e"
+    },
+    {
+      "doc_uuid": "3b93d31e5a33489384c87b582339ed77",
+      "docType": 3,
+      "path": "source/pcb_3b93d31e5a33489384c87b582339ed77.json",
+      "size": 230028,
+      "sha256": "9cf06aa7e55fa83b6e76aeaaa1224f686b1e13f204199115f59c4e0e7cb2ec22"
+    },
+    {
+      "doc_uuid": "baf0e37f08334ecf8a0369474911c943",
+      "docType": 3,
+      "path": "source/pcb_baf0e37f08334ecf8a0369474911c943.json",
+      "size": 67857,
+      "sha256": "69b312f973b32a68a1db1384d5f05d397b2f90abae8943cec3deb9b3fb0c03cf"
+    },
+    {
+      "doc_uuid": "90a3dd614a2544a8bf056af698e0019e",
+      "docType": 3,
+      "path": "source/pcb_90a3dd614a2544a8bf056af698e0019e.json",
+      "size": 265369,
+      "sha256": "78ab71660bd909ed0d56caa57a15f23d1126583c9306ee77f9992dab89c9e10e"
+    }
+  ],
+  "editor_version": "2.1.20.656218ea.b3811b"
 }