perf(ModelIntersections): compute them in parallel #318

Job	Run time
test / prepare / prepare	26s
test / tidy	3s
test / semantic-commit / semantic-commit	5s
test / test-repository / test-windows-python / windows-python (3.14)	5s
test / test-repository / test-windows / windows	4s
test / test-repository / test-linux-python / linux-python (3.14)	4s
test / test-repository / test-linux / setup-linux-systems	3s
test / test-repository / test-linux / linux	1s
test / release	-1s
test / deploy-repository	-1s
	49s

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