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/53e6c236b9d14e74944e460ac11c7c1d/source/manifest.json

@@ -0,0 +1,52 @@
+{
+  "project_uuid": "53e6c236b9d14e74944e460ac11c7c1d",
+  "fetched_at": "2026-04-28T17:54:20.048730+00:00",
+  "editor_version": "2.1.32.5533625a.f972c4",
+  "boards": [
+    {
+      "sch": "6cbcd66b61c2406d9e25c8e9a376bacc",
+      "pcb": "0e29a50ddd1946bab5f24f135c76ca25",
+      "name": "Board1"
+    }
+  ],
+  "documents": [
+    {
+      "doc_uuid": "dc7c6b0a79e742f9995551d33f26dee6",
+      "docType": 1,
+      "path": "source/dc7c6b0a79e742f9995551d33f26dee6.json",
+      "size": 135974,
+      "sha256": "7dcb5c1110cf8136c09488c988d31ac814237d5a4eaf3c867fb3692edd956043"
+    },
+    {
+      "doc_uuid": "fa2e0555acf44dc39c367652c4da28e7",
+      "docType": 1,
+      "path": "source/fa2e0555acf44dc39c367652c4da28e7.json",
+      "size": 64265,
+      "sha256": "0bacef652eb8b16b804bc740e7638b8c34fd2418c587e6858eac2df1667cf4c6"
+    },
+    {
+      "doc_uuid": "0e29a50ddd1946bab5f24f135c76ca25",
+      "docType": 3,
+      "path": "source/pcb_0e29a50ddd1946bab5f24f135c76ca25.json",
+      "size": 155537,
+      "sha256": "589865ae1a201ab416b0d408eb0155f460b6fd89e35652487648c42cff96f128"
+    }
+  ],
+  "structure_summary": {
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+    "schematic_containers": 1,
+    "schematic_sheets": 2,
+    "pcbs": 1,
+    "symbols": 518,
+    "footprints": 165,
+    "devices": 588,
+    "coppers": 6,
+    "textpath": 3,
+    "blobs": 7
+  },
+  "aux": {
+    "coppers_count": 0,
+    "textpath_count": 3,
+    "blobs_count": 7
+  }
+}