Add GraphNode identity cache for stable object round-trips#1853

Merged

Andy-Jost merged 17 commits intoNVIDIA:mainfrom

Andy-Jost:graph-node-identity

Apr 3, 2026

Commits on Apr 2, 2026

Reorganize graph test files for clarity
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Enhance Graph.update() and add whole-graph update tests
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Add AdjacencySet proxy for pred/succ and GraphNode.remove()
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Add edge mutation support and MutableSet interface for GraphNode adjacencies
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Use requires_module mark for numpy version checks in mutation tests
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Fix empty-graph return type: return set() instead of () for nodes/edges
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Rename AdjacencySet to AdjacencySetProxy, add bulk ops and safety guards
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Add destroy() method with handle invalidation, remove GRAPH_NODE_SENTINEL
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Add GraphNode identity cache for stable Python object round-trips
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Purge node cache on destroy to prevent stale identity lookups
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Skip NULL nodes in graph_node_registry to fix sentinel identity collision
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