start porting model specs into heromodels

heromodels/src/models/mod.rs

@@ -1,8 +1,16 @@
 // Export submodules
 pub mod core;
 pub mod userexample;
+// pub mod productexample; // Temporarily remove as files are missing
+pub mod calendar;
+pub mod governance;
+pub mod finance;
 
 // Re-export key types for convenience
 pub use core::Comment;
 pub use userexample::User;
-
+// pub use productexample::Product; // Temporarily remove
+pub use calendar::{Calendar, Event, Attendee, AttendanceStatus};
+pub use governance::{Proposal, ProposalStatus, VoteEventStatus, Ballot, VoteOption};
+pub use finance::{Account, Asset, AssetType};
+pub use finance::marketplace::{Listing, ListingStatus, ListingType, Bid, BidStatus};