Teach package runtime edge materialization

src/schema-ir.ts

@@ -28,6 +28,11 @@ export type Cardinality =
 
 export type EdgeDirectionality = "directed" | "undirected";
 
+export type EdgeMaterialization = {
+  class: SymbolRef;
+  connectProjection: string;
+};
+
 export type FieldStorageKind =
   | "stored"
   | "derived"
@@ -90,6 +95,7 @@ export type EdgeEndpointSchema = {
   projection: string;
   cardinality: Cardinality;
   indexed: boolean;
+  materialization?: EdgeMaterialization;
 };
 
 export type EdgeSchema = {