Macroforge MCP Server

## Cycle/Forward-Reference Support Uses deferred patching to handle references: 1. When encountering `{ "__ref": id }`, returns a `PendingRef` marker 2. Continues deserializing other fields 3. After all objects are created, `ctx.applyPatches()` resolves all pending references References only apply to object-shaped, serializable values. The generator avoids probing for `__ref` on primitive-like fields (including literal unions and `T | null` where `T` is primitive-like), and it parses `Date` / `Date | null` from ISO strings without treating them as references.