diff --git a/docs/research/2026-09-01-overhaul/s3-walk-ownership-map.md b/docs/research/2026-09-01-overhaul/s3-walk-ownership-map.md
index 88462fdd..75315c10 100644
--- a/docs/research/2026-09-01-overhaul/s3-walk-ownership-map.md
+++ b/docs/research/2026-09-01-overhaul/s3-walk-ownership-map.md
@@ -153,7 +153,17 @@ Lead verifies every finding against the source before an edit (S2 precedent:
   it — the same leak acdream shows at the same spot. This pose is S3/S4's
   primary oracle: the target is to reproduce retail's frame at it, leak
   included.
-- Remaining poses per the kit README: `cathedral-arrival`, `holtburg-doorway-still`,
+- **Pose `cathedral-arrival`** (owner "ready" 2026-09-03 06:58): transcript
+  `logs/oh-capture/cathedral-arrival.walk.log` (5 frames, 5,604 lines: main
+  PView `009d4f48` DI `f4180108`, DC `ov=3` n=2 `f4180108 f4180107`; a SECOND
+  PView `009d4530` with `ov=0` draws cells `f4180113/f4180112/f4180114` each
+  frame with no DI of its own — its identity is a chunk-2 audit item; 454
+  `LC` + 619 `SC` per frame, 40 EC / 40 OC total), `cathedral-arrival.parts.log`
+  (3 frames, 7,822 PD / 1,240 DM), `cathedral-arrival.alphadepth.log` (5 frames,
+  1,735 AM / 3,570 FL / 35 PM / 19 PC). NOTE: the kit README expected
+  `DI f4180106` (FW0's arrival still); the live client reported `f4180108`,
+  the stair-chamber cell — the owner's actual standing cell, recorded as-is.
+- Remaining poses per the kit README: `holtburg-doorway-still`,
   `terrace-edge`, `foundry-deep`.
 
 ## 7. Open questions for the capture session (ask for exactly these two)