🔗 Show & Tell: Phase 44.1 — GraphConvolutionEngine

[web3guru888]

Share implementations, benchmarks, and experiments with the GraphConvolutionEngine (GCN, GAT, GraphSAGE, GIN).\n\nRelated Issue: #873\nPlanning: #872\n\nTopics:\n- Message-passing performance benchmarks\n- Neighborhood sampling strategies\n- Multi-head attention patterns\n- Sparse operation optimizations