Implement implicit object references and capability query foundations

src/query/schema.ts

@@ -12,6 +12,7 @@ import {
   GraphQLNonNull,
   GraphQLSchema,
   specifiedDirectives,
+  visit,
   type GraphQLOutputType,
   type GraphQLInputType,
   type GraphQLFieldConfigMap,
@@ -261,6 +262,19 @@ export function querySchema(
   };
   const schema = new GraphQLSchema({
     directives: specifiedDirectives,
+    // Nominal projections can mention an interface not reached by a relation.
+    types: (() => {
+      const requested = new Set<string>();
+      if (document)
+        visit(document, {
+          NamedType(node) {
+            requested.add(node.name.value);
+          },
+        });
+      return [...contracts.values()]
+        .filter((contract) => !contract.template && requested.has(name(contract.revisionId)))
+        .map((contract) => object(contract.revisionId));
+    })(),
     query: new GraphQLObjectType({
       name: "QxQuery",
       fields: { root: { type: new GraphQLNonNull(object(root.interface)) } },