docs(render): owner S3 double-check — all poses PASS except the zoomed-out cathedral stairwell (#464); matrix row added

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

docs/ISSUES.md

@@ -39,6 +39,16 @@ confirmed closed by the owner, 11 need a focused live gate, and 43 are safe to
 remain closed. See
 [`docs/research/2026-08-28-owner-closed-issue-validity-audit.md`](research/2026-08-28-owner-closed-issue-validity-audit.md).
 
+## #464 — Camera zoomed out in the cathedral stairwell leaves the cell; the frame roots from outside and draws the hall through the walls
+
+**Status:** OPEN — owner-reported 2026-09-03 night during the S3 double-check (Release at `ea76a3803`); every other pose PASSED the owner's look.
+**Severity:** HIGH for the campaign (Campaign OVERHAUL v2's G3 owner gate names "floating stairs … pan/zoom" as a pass criterion; the retail frame at the same pose is clean)
+**Component:** the chase camera's swept-sphere collision (`RetailChaseCamera`, `ACDREAM_CAMERA_COLLIDE`) and/or the render root's camera-cell resolution
+
+**Symptom:** at `/teleloc F4180113 39.502899 19.589222 181.119247 1 0 0 0` (and within a metre: `F4180112 39.070965 22.549135 178.781418`, `F4180113 39.364658 21.293159 179.773422`), zooming the third-person camera fully out and tilting it slightly up shows the big vaulted hall, an archway with sky beyond, a balcony below, and the stair slabs floating with their stairwell walls missing. Retail (owner's own screenshot, same pose and zoom) keeps the eye just under the stairwell ceiling and the walls stay solid. Reading: acdream's eye passes out of the stairwell where retail's `SmartBox::update_viewer` @0x00453ce0 sweep (0.3 m `viewer_sphere` through `CTransition::find_valid_position` from the head pivot to `viewer_sought_position`) stops it, and the frame then roots from a cell the eye should never be in (or from none).
+
+**Matrix:** row added to the campaign plan §10 ("Cathedral stairwell, camera zoomed out") with the invariant; a read-only investigation against the decomp is running (mechanism, differences from retail's sweep, root cause, retail-faithful fix). Not an S4 depth/alpha item; it is the camera-versus-cell rule, and it blocks G3.
+
 ## #463 — Soak `turn` samples can report a 0.1 ms GPU p50 (the turn window catches non-world frames)
 
 **Status:** OPEN — found 2026-09-03 by the Campaign OVERHAUL v2 S3 review's perf re-measure.