Add independently owned reconnectable execution units (WI-03)

src/execution-world/index.ts

@@ -4,6 +4,7 @@ export * from "./ports.js";
 export * from "./files.js";
 export * from "./installation.js";
 export * from "./client-contracts.js";
+export * from "./execution-groups.js";
 
 export * from "./receipts.js";