docs(render): AD-117 item 1 retired — the render-only destination-cell move is retail's own zero-sphere find_cell_list

CObjCell::find_cell_list (0x0052b4e0) with num_sphere == 0 adds only the
current cell — interior CELLARRAY::add_cell at 0x0052b563, outdoor
CLandCell::add_all_outside_cells (0x00533630, the arg2 <= 0 branch:
adjust_to_outside + gid_to_lcoord + add_outside_cell) — and skips the
portal transit walk (`arg4 != 0 && arg2 != 0` at 0x0052b576). So a shapeless
object's transition cell array is its destination cell alone, exactly what
RefreshPositionRows publishes. Not an adaptation; the register row keeps
its three residual readings, the S3 packet drops the capture request, and
the registry/test comments cite the verified function.

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

tests/AcDream.Core.Tests/Physics/ShadowObjectRegistryRetailCellArrayTests.cs

@@ -1238,7 +1238,8 @@ public class ShadowObjectRegistryRetailCellArrayTests
         // A render-only owner has no collision cells to republish from, so
         // its "cell did not change" commit would otherwise freeze it at its
         // registration cells forever (retail review F3): it travels with its
-        // destination cell instead (AD-117).
+        // destination cell instead — retail's own zero-sphere find_cell_list
+        // (0x0052b4e0: add the current cell, skip the transit walk).
         reg.CommitSetPosition(
             entityId, new Vector3(42f, 12f, 50f), Quaternion.Identity,
             seedCellId: CellB, worldOffsetX: OffX, worldOffsetY: OffY,