huskies: merge 1116 story rebuild_and_restart loses pending CRDT ops by calling exec() before persistence channel drains

server/src/rebuild.rs

@@ -189,6 +189,11 @@ pub async fn rebuild_and_restart(
         n.notify(ShutdownReason::Rebuild).await;
     }
 
+    // 5b. Drain the persistence channel so no queued ops are lost when exec()
+    //     replaces this process.  Times out after 5 s with a logged warning
+    //     naming the queue depth so any regression is visible in logs.
+    crate::crdt_state::flush_persistence(std::time::Duration::from_secs(5)).await;
+
     // 6. Re-exec with the new binary.
     //    Use the cargo output path rather than current_exe() so that rebuilds
     //    inside Docker work correctly — the running binary may be installed at