Preserve net-owned obstacle regions

[0hmX]

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Project	Deployment	Actions	Updated (UTC)
tiny-hypergraph	Ready	Preview, Comment	Jul 17, 2026 6:08am

[0hmX]

It was removing obstacle regions that did not contain a connection endpoint.

But due to component topology generation with rectangles, some obstacle regions do not contain an endpoint but are still assigned to a net. Those net-owned regions must be preserved, because they can contain valid routing ports and edges.

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