Extract classifications for a single entity ON-DEMAND.
Uses the onDemandClassificationMap built during parsing.
Falls back to relationship graph when on-demand map is not available (e.g., server-loaded models).
Also checks type-level associations via IfcRelDefinesByType.
Returns an array of classification references with system info.
Extract classifications for a single entity ON-DEMAND. Uses the onDemandClassificationMap built during parsing. Falls back to relationship graph when on-demand map is not available (e.g., server-loaded models). Also checks type-level associations via IfcRelDefinesByType. Returns an array of classification references with system info.