bcollazo / catanatron / 29432872710

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fix: block road extension through opponent's settlement endpoint (#377)

* fix: block road extension through opponent's settlement endpoint

When a settlement is built on a node that is the endpoint of an
opponent's road (len == 1), the node was not removed from the opponent's connected components. This allowed the opponent to later build a road from that blocked endpoint, bypassing the "cannot build through a settlement" rule.

The len == 2 case (settlement in the middle of a road) was already handled correctly.

* test: add unit test for road extension past enemy settlement endpoint

Add test to ensure roads cannot extend past enemy settlements.

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