Add synthetic print and structure features

- Export synthetic market types
- Track special print conditions and derived cluster features
- Add same-size leg symmetry to structure packets

packages/types/src/index.ts

@@ -2,3 +2,4 @@ export * from "./events";
 export * from "./live";
 export * from "./options-flow";
 export * from "./sp500";
+export * from "./synthetic-market";