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/29ff00b5fc83498681271320e8855bc7/metadata.json

@@ -41,5 +41,26 @@
     "public": true,
     "publish": true,
     "skipped_files": []
-  }
+  },
+  "source_format": "easyeda-std",
+  "source_path": "source/",
+  "source_documents": [
+    {
+      "doc_uuid": "22a382542bac433fa7beb5e56344d0df",
+      "docType": 3,
+      "master": "ed6980606b594f14893902f8a6b44ad1",
+      "path": "source/22a382542bac433fa7beb5e56344d0df.json",
+      "size": 1115949,
+      "sha256": "609c7ce57378cec05bb6567437470221f08d80c352f639f7335305cd90a57d4f"
+    },
+    {
+      "doc_uuid": "1c8152da710640eb850a33f500782d57",
+      "docType": 3,
+      "master": "1af1c157b84a42bc8d78153b76986b3f",
+      "path": "source/1c8152da710640eb850a33f500782d57.json",
+      "size": 1148581,
+      "sha256": "035ae81fd9d8a9de1b3fc0199c0a8ecd87e9f4636ec24a74f6acbd91a96028bf"
+    }
+  ],
+  "editor_version": "6.5.25"
 }