User's own decomp dig (verified): the flap's deepest root is architectural, not the
find_cell_list pick ordering. Retail membership is persistent object STATE (curr_cell
mutated ONLY by change_cell at a portal crossing); acdream RE-DERIVES CellId from
FindCellSet geometry every tick → ping-pong. Plus multi-valued CELLARRAY (retail) vs
single CellId (acdream), uniform vs forked collision (0x0100), intrinsic vs bridge
building entry. Reframed the handoff + prompt: the pick-ordering port (§4.3) is
SUPERSEDED/symptomatic; the job is STAGE 1 = persistent + multi-valued + portal-
crossing membership (change_cell 281192, find_transit_cells, SetPositionInternal),
drop the 5ca2f44 pre-check; STAGE 2 = uniform collision + intrinsic entry. New §4.4
(the 4-point analysis) + §4.5 (staged fix).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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