feat(sync): Phase 3 - resilience and health tracking

- Add RelayHealthTracker with DashMap
- Implement exponential backoff (5s -> 1h max)
- Handle dead relays (24h failures -> daily retry)
- Add startup jitter to prevent thundering herd
- Add NGIT_SYNC_MAX_BACKOFF_SECS config

1 files changed, 2 insertions, 1 deletions

diff --git a/src/main.rs b/src/main.rs
index 31e7cf6..9273afd 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -51,13 +51,14 @@ async fn main() -> Result<()> {
             config.domain
         );
 
-        // Start SyncManager for proactive sync (Phase 2: multi-relay support)
+        // Start SyncManager for proactive sync (Phase 2: multi-relay support, Phase 3: health tracking)
         // Even without initial sync_relay_url, SyncManager can discover relays from stored announcements
         let sync_manager = SyncManager::new(
             config.sync_relay_url.clone(),
             config.domain.clone(),
             relay_with_db.database.clone(),
             relay_with_db.write_policy.clone(),
+            &config,
         );
 
         if config.sync_relay_url.is_some() {