Guard reconcile reentrancy and deleted-routine duplication; cache exercise info parsing

Workouts/Sync/SyncEngine.swift

@@ -407,7 +407,7 @@ final class SyncEngine {
     /// when the engine isn't connected.
     @discardableResult
     func duplicate(routine: Routine) async -> String? {
-        guard store != nil else { return nil }
+        guard store != nil, routine.isLive else { return nil }
 
         var doc = RoutineDocument(from: routine)
         doc.id = ULID.make()
@@ -767,6 +767,10 @@ final class SyncEngine {
     /// changes accumulated while the app was closed are picked up.
     private func reconcile() async {
         guard let store, let tombstones else { return }
+        // Drop a reconcile that overlaps a running one — redundant, since the
+        // running pass covers the same tree and the metadata observer picks up
+        // anything newer.
+        guard !isSyncing else { return }
         isSyncing = true
         defer { isSyncing = false }