The 4 uploadMediaUrl reinforcement seeds added in the corrective round (134-137) share a
6-gram with g5-03-card-producto ('foto real traida de https picsum'). v2b-bf16 is already
trained on that text -- editing the seed corpus now cannot retroactively decontaminate it.
This lets the disjoint check acknowledge that specific, already-baked-in overlap explicitly
(never silently) instead of hard-aborting gate5 full mode entirely.