CodeReclaimers / neat-python / 24263143819

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Fix mutate_add_node innovation deduplication (issue #291)

The dedup key included the newly-allocated node ID, which is always
unique, so the tracker lookup never matched across genomes. Key by
the original connection endpoints instead via a new get_node_split()
method that also shares the node ID across genomes splitting the same
connection in one generation.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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