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/c610a9bc18ac4a17a88ab6e427a25d6f/source/manifest.json

@@ -0,0 +1,43 @@
+{
+  "project_uuid": "c610a9bc18ac4a17a88ab6e427a25d6f",
+  "fetched_at": "2026-04-28T17:55:10.785346+00:00",
+  "editor_version": null,
+  "boards": [
+    {
+      "sch": "c108b78715bf480382a5fc439f0b55ad",
+      "name": "Board1",
+      "pcb": "80e001e97f1d40b09f0d4cabc8cad82a"
+    }
+  ],
+  "documents": [
+    {
+      "doc_uuid": "0ff87537486142189a10b54b6ba70e02",
+      "docType": 1,
+      "path": "source/0ff87537486142189a10b54b6ba70e02.json",
+      "size": 145913,
+      "sha256": "b197fcf14dfa70778612ff8acb83ba96e86e9c22b4e94621a71b61be7a94eb6b"
+    },
+    {
+      "doc_uuid": "80e001e97f1d40b09f0d4cabc8cad82a",
+      "docType": 3,
+      "path": "source/pcb_80e001e97f1d40b09f0d4cabc8cad82a.json",
+      "size": 931136,
+      "sha256": "6748513ee0462c007f38197f635b2b1a6f7fd1650dbe4d1e53d4ce332c953978"
+    }
+  ],
+  "structure_summary": {
+    "boards": 1,
+    "schematic_containers": 1,
+    "schematic_sheets": 1,
+    "pcbs": 1,
+    "symbols": 59,
+    "footprints": 61,
+    "devices": 154,
+    "coppers": 12,
+    "textpath": 0,
+    "blobs": 0
+  },
+  "aux": {
+    "coppers_count": 0
+  }
+}