Add undirected edge support to package runtime

src/schema-ir.ts

@@ -26,6 +26,8 @@ export type Cardinality =
   | "many_ordered"
   | "many_unique_ordered";
 
+export type EdgeDirectionality = "directed" | "undirected";
+
 export type FieldStorageKind =
   | "stored"
   | "derived"
@@ -92,6 +94,7 @@ export type EdgeEndpointSchema = {
 
 export type EdgeSchema = {
   id: SymbolRef;
+  directionality: EdgeDirectionality;
   sourceField: string;
   fromClass: SymbolRef;
   toClass: SymbolRef;