Replace the brittle 'self.position == other.position_before' check
with a symmetric cell-intersection test: two rats are considered
colliding if any of their current/previous cells overlap. This handles
both 'both rats in same cell' and 'one rat enters the cell the other
just left'.
Also remove the erroneous hasattr(other_unit, 'fuck') guard that
prevented Male.fuck() from being called on Female (Female has no fuck
method, but only Male should initiate reproduction).
Add tests/test_rat_reproduction.py with 8 scenarios covering overlapping
rats, baby rats, already-pregnant females, far-apart rats, female
self-initiation, sound playback, and procreate interval spawning.
enne2
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