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/72312817efb6449ca520216c820c432c/metadata.json

@@ -73,5 +73,107 @@
     "public": true,
     "publish": true,
     "skipped_files": []
-  }
+  },
+  "source_format": "easyeda-pro-legacy",
+  "source_path": "source/",
+  "source_documents": [
+    {
+      "doc_uuid": "114c98781da44a8d8500961af356e015",
+      "docType": 1,
+      "path": "source/114c98781da44a8d8500961af356e015.json",
+      "size": 2470,
+      "sha256": "6422a74515f49ba0b9e738083f4a99785b837dd17c7fe8f51a3d966af25383fb"
+    },
+    {
+      "doc_uuid": "4cf01a20ad32434ba83a216f76b84e01",
+      "docType": 1,
+      "path": "source/4cf01a20ad32434ba83a216f76b84e01.json",
+      "size": 9123,
+      "sha256": "63000f37567a0b533e5860552cde8a7da79efb571427964b51b5f09dd4dd0c9d"
+    },
+    {
+      "doc_uuid": "d5835e7035e34cb1a77334fa859161b3",
+      "docType": 1,
+      "path": "source/d5835e7035e34cb1a77334fa859161b3.json",
+      "size": 9832,
+      "sha256": "fe72df4b81fcb4b3cebb7ce2f6350edc0802a8db4b5c1497335f0f9d954f6afa"
+    },
+    {
+      "doc_uuid": "a2cf82a2329340df860fea80a094f72d",
+      "docType": 1,
+      "path": "source/a2cf82a2329340df860fea80a094f72d.json",
+      "size": 2467,
+      "sha256": "3c764293e66e9dc8b5d0951a33fd64ca6c401e8174c52ac960664dadde230cb8"
+    },
+    {
+      "doc_uuid": "5b10bd9ae9c941eebb59daa95e0c3902",
+      "docType": 1,
+      "path": "source/5b10bd9ae9c941eebb59daa95e0c3902.json",
+      "size": 32544,
+      "sha256": "05f9d797a2a3d56b8483132d79ff5d522ecf7924ca76650b0ce2e6749cb5db51"
+    },
+    {
+      "doc_uuid": "49fe89f98ae14203924474d2aea7d4ae",
+      "docType": 1,
+      "path": "source/49fe89f98ae14203924474d2aea7d4ae.json",
+      "size": 100242,
+      "sha256": "4eb4282c582bb5339ef1d1146068abe6a7cd7fe4059ae713932f680a38d527c3"
+    },
+    {
+      "doc_uuid": "fb222c2c2b044a73987942f71f78135d",
+      "docType": 1,
+      "path": "source/fb222c2c2b044a73987942f71f78135d.json",
+      "size": 67008,
+      "sha256": "cc7aa62ad870e58d5068ecb375a9884bc996503b6ee33cfe235257adb8a380a5"
+    },
+    {
+      "doc_uuid": "9ba3a1ca67e04287a5d333064a720431",
+      "docType": 1,
+      "path": "source/9ba3a1ca67e04287a5d333064a720431.json",
+      "size": 118411,
+      "sha256": "7f15f89e322a2f217daffa165908cb3a91ab82fe6ff9c9aa5497fa3f28a52474"
+    },
+    {
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+      "docType": 1,
+      "path": "source/5d7b034bb6e84ce8bd8abb7819227153.json",
+      "size": 50927,
+      "sha256": "4275e7e6212dfc9253dbddf9fd687662469b4bc8991fb3373ca15537bf380624"
+    },
+    {
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+      "docType": 1,
+      "path": "source/10b02cc9598e4c8db6c56491478421bd.json",
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+      "sha256": "e62acefdad0ab2f948e5876f4cba5f42ed2df6527ef2f4a8dea42d86b39dbfa5"
+    },
+    {
+      "doc_uuid": "cb8a8f71b44d4595ba46ac0a4c978b51",
+      "docType": 1,
+      "path": "source/cb8a8f71b44d4595ba46ac0a4c978b51.json",
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+      "sha256": "29b0fdf3a098c5cee832c1a3abc1328a0b08c0b5add6c076c1e6c062bdc7eef2"
+    },
+    {
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+      "docType": 1,
+      "path": "source/d45e179dbe4d45178a28c47b6c9eaa56.json",
+      "size": 32794,
+      "sha256": "1b4ce4b31980d2956612fe230130ba571bd61263d424ce5ba3960a9b0eb62407"
+    },
+    {
+      "doc_uuid": "4aa32dbf320e48cdad135ad43e5cfddc",
+      "docType": 1,
+      "path": "source/4aa32dbf320e48cdad135ad43e5cfddc.json",
+      "size": 54985,
+      "sha256": "d2d108b208b56ebc873cdb2e2a708b3994b2cd3c6641724b3b185dd77b08555f"
+    },
+    {
+      "doc_uuid": "61b4a243af74490ab6937d1f78f638aa",
+      "docType": 3,
+      "path": "source/pcb_61b4a243af74490ab6937d1f78f638aa.json",
+      "size": 1349815,
+      "sha256": "46b68821a7282baab79e1bbed19aae970fba1078273af283efb7d4bc5cd31334"
+    }
+  ]
 }