feat(sync): Phase 5 - negentropy catchup (NIP-77)

- Add NegentropyService for set reconciliation
- Implement startup catchup with warm-up delay
- Implement reconnect catchup (last 3 days)
- Add daily catchup schedule with stagger

1 files changed, 2 insertions, 0 deletions

diff --git a/src/sync/mod.rs b/src/sync/mod.rs
index 4dca160..dc11812 100644
--- a/src/sync/mod.rs
+++ b/src/sync/mod.rs
@@ -21,11 +21,13 @@ mod connection;
 mod filter;
 pub mod health;
 mod manager;
+pub mod negentropy;
 mod subscription;
 
 pub use filter::FilterService;
 pub use health::{HealthState, RelayHealth, RelayHealthTracker};
 pub use manager::SyncManager;
+pub use negentropy::NegentropyService;
 pub use subscription::SubscriptionManager;
 
 use std::net::SocketAddr;