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/126f1a61e36a4e859cd7a0c15ddcefe5/source/manifest.json

@@ -0,0 +1,76 @@
+{
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+  "fetched_at": "2026-04-28T17:53:57.347937+00:00",
+  "editor_version": "2.2.27.1",
+  "boards": [
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+      "name": "V1.2",
+      "pcb": "a2a4737cbb7449b08d418b289ec02f9e"
+    }
+  ],
+  "documents": [
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+      "docType": 1,
+      "path": "source/197f41fabb3f44e4901875114bf4b71c.json",
+      "size": 811,
+      "sha256": "9a46331d258f457716ac55f1468c378aa9e4ffc5b4264ffbc26c985e205345fe"
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+      "path": "source/c5c2c8d333bd42cdbcb48cf211d9c792.json",
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+      "sha256": "4d99ca1283abb364b50f8a5b163546e1ae4ebb95304456cbaee17e6868ecf3b5"
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+      "path": "source/29357eb693a641bbbef932a480c6d75e.json",
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+      "sha256": "c2b2270087f85f83ead324c7fb5a6d666e22ac7e3725ca8467e098d17873c7ef"
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+      "path": "source/7f3d41085830496cb43695220ebf5399.json",
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+      "sha256": "8324b0013627226d6806d1c5f31f8586de25b218bb99c7d4ff345d6fe3c7858f"
+    },
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+      "path": "source/731c33786aae4ec6838cfdd7f15b2c0c.json",
+      "size": 725,
+      "sha256": "08a996bf3f2b9f328f6bca23ef73ce436377abe2124943b443e224fa87cc1ca4"
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+      "size": 725,
+      "sha256": "4f2e8037510b835fae9087cd4aa877d4d2f78168a5cec4757fe7217a33e44add"
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+      "path": "source/pcb_a2a4737cbb7449b08d418b289ec02f9e.json",
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+      "sha256": "77a94028f0054a40385d29a3a87968bf576bfc4b128f28519e4de28955d789bf"
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+    "schematic_containers": 1,
+    "schematic_sheets": 6,
+    "pcbs": 1,
+    "symbols": 57,
+    "footprints": 26,
+    "devices": 49,
+    "coppers": 0,
+    "textpath": 0,
+    "blobs": 0
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+}