graph_accel: generic edge filtering and non-KG schema validation

[aaronsb]

Context

Phase 4.5 of ADR-201 — making graph_accel work as a general-purpose AGE acceleration extension, not just for the knowledge graph schema.

Remaining items

• Edge filtering: skip edges where source/target not in loaded node set
• Test with a non-knowledge-graph AGE schema to verify generality

Already done

• graph_accel.node_labels filtering — implemented and tested
• graph_accel.edge_types filtering — implemented
• graph_accel.node_id_property — implemented and tested