Original acdream capture (a9a427f) was a doorway-walk because acdream's
indoor stair physics doesn't work. For A6.P2 to characterize the
divergence we need the FAILURE captured, not a substitute walk.
User re-attempted the inn stairs in acdream (whatever it produces:
bumping, sliding, stuck). Failure signature is dramatic vs door-walk:
Tag | door-walk | stair-attempt | ratio
----------------+-----------+---------------+------
push-back-disp | 1,141 | 4,156 | 3.6x
push-back-cell | 87 | 1,478 | 17x
other-cells | 87 | 1,478 | 17x
indoor-bsp | 343 | 1,286 | 3.7x
indoor-walkable | 227 | 859 | 3.8x
cp-write | 70,244 | 33,969 | 0.5x (!)
The 17x explosion on push-back-cell / other-cells says acdream's
CheckOtherCells loop fires constantly when physics can't resolve a
stair-step — the indoor BSP query fails, then the multi-cell
fallback fails, then the next tick repeats. The cp-write DROP
(half the door-walk volume) is the inverse signal: when no ground
plane resolves, no CP gets written. Both are A6.P2 fix-surface
indicators.
Now scen2 pair = retail successfully climbs (BP2 step_up=188) vs
acdream tries and fails (push-back-cell explosion).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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