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/f2a2530d6e1848109aeda5fd5f9e38d9/source/manifest.json

@@ -0,0 +1,43 @@
+{
+  "project_uuid": "f2a2530d6e1848109aeda5fd5f9e38d9",
+  "fetched_at": "2026-04-28T17:55:36.446899+00:00",
+  "editor_version": "2.2.37.7",
+  "boards": [
+    {
+      "sch": "f6389d8b9eaa484b818addff272db765",
+      "name": "Board",
+      "pcb": "8218d379271549aea6b9ceece458f655"
+    }
+  ],
+  "documents": [
+    {
+      "doc_uuid": "3f2aaa923b7444f5b088b925fcf3ea3c",
+      "docType": 1,
+      "path": "source/3f2aaa923b7444f5b088b925fcf3ea3c.json",
+      "size": 813,
+      "sha256": "1d6b9107533e6bd386508605a768c15fa60d0b005c68bfa0d6788c39ccb5908c"
+    },
+    {
+      "doc_uuid": "8218d379271549aea6b9ceece458f655",
+      "docType": 3,
+      "path": "source/pcb_8218d379271549aea6b9ceece458f655.json",
+      "size": 829,
+      "sha256": "97e484fbc17af49b90d76ea251e187c4d681deeac014586fdc3466d5465695d4"
+    }
+  ],
+  "structure_summary": {
+    "boards": 1,
+    "schematic_containers": 1,
+    "schematic_sheets": 1,
+    "pcbs": 1,
+    "symbols": 34,
+    "footprints": 21,
+    "devices": 34,
+    "coppers": 0,
+    "textpath": 0,
+    "blobs": 10
+  },
+  "aux": {
+    "blobs_count": 10
+  }
+}