Source-reviewed portal route from837[32,95]: LEFT E115 ->836[69,94]; route62,59 UP E49 ->837[36,70]; route44,68 RIGHT E126 ->836[73,51]; route82,68 DOWN E45 ->837[46,77]; route35,89 DOWN E114 ->836[62,84]; route62,68 UP E83 ->831[32,34]. Actual queue verification in progress. Portal836E78[64,80] faces DOWN and returns866; earlier contrary note was incorrect. Computed by work/portal_plan273.py using static installed transfer commands and route graphs.