Review findings: a district backbone anchored at a server inside a building
got no lanes because lane endpoints keyed on the node's own building; the
endpoint now resolves the construct the node stands in. Construct gates
preferred any open tile, including dead-end alleys; they now prefer the
largest open-grid component. City::validate gains GateSealed: every
construct gate must reach its district backbone over walkable Net tiles.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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