BD Combine Edge Metadata

Combine edge metadata from multiple detection sources. Use this to union edges from: - BD_PlanarGrouping (structure-based boundaries) - BD_BlenderEdgeMarking (color/angle-based edges) - Any other edge detection node POSITION-BASED DEDUPLICATION: This node uses vertex POSITIONS (not indices) for deduplication. This correctly handles face-split meshes where the same geometric edge may have different vertex indices in different sources. Connect 'reference_mesh' to enable index remapping for downstream nodes. Without it, output will use indices from the first source containing each edge. Example workflow: [Mesh] ─┬─→ [PlanarGrouping] ──→ edge_metadata_1 ─┐ │ │ └─→ [EdgeMarking] ─────→ edge_metadata_2 ─┼─→ [CombineEdgeMetadata] → [MergePlanes] │ [Final Mesh] ─────────────────→ reference_mesh ───┘