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村人の家や村の検知範囲について英語wiki探してみたら該当するのが2箇所あった

As the villagers move around, the area near them (a 16x16 square centered at the northwest of the block the villager is standing plus a height of 10, starting at 2 blocks above their head and ending 6 blocks below their feet)
is occasionally checked for new valid doors ("houses").

If a villager finds itself outside the village boundary, or a villager without a village detects a village boundary within 32 blocks, it will move quickly back within the boundary.

前者はドア（家）の検知範囲（16x10x16）について、後者は村（32の球状？）の検知についてだろう
ちなみに村人の繁殖条件については

However, any villager within the horizontal boundary of the village and within the spherical boundary of the village will attempt to enter mating mode as long as there is at least one villager within the boundary.

ということで、村の範囲（水平および球状の境界）内に入ってれば良いわけで 、村人の検知範囲云々は関係ないと思われる
英語は苦手だから間違ってたらごめん