Standing/pacing the Agent of Arcanum doorway in the acdream client with ACDREAM_PROBE_CELL=1:
the player [cell-transit] sequence is clean + monotonic and crosses at the same Y thresholds as
retail's aligned golden, firing only on character movement (never camera-only). So P1 membership
is correct LIVE, matching the conformance proof.
The visible flap + purple void are the RENDER half, not membership: the flap is the camera-collision
residual (chase eye drifts out of the player cell -> viewer-cell flips; master-plan P3,
SmartBox::update_viewer), the void is the unported PView seal (master-plan P4). The user's intuition
"transition feels tied to the camera" is retail-faithful: retail keys the render on the viewer
(camera) cell, physics+lighting on the player cell.
Per user direction, P2 door collision is next; the render half (P3 camera -> P4 PView) follows.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
