Guard every persisted read of retained workout models with isLive

A remotely deleted @Model traps on any persisted-property read, including
the observed expression of .onChange, which SwiftUI evaluates on every
body pass. Guard those expressions, the onAppear takeover read, and the
summary sheet's document mapping.

Claude-Session: https://claude.ai/code/session_01PKptrgbx74peTwHGRxBojv

Workouts Watch App/Views/WorkoutLogListView.swift

@@ -112,10 +112,12 @@ struct WorkoutLogListView: View {
         // ingesting our latest edit) must not regress what the user is looking
         // at. Clock skew across devices degrades this to a skipped absorb —
         // never to a clobber of local state.
-        .onChange(of: workout.updatedAt) { _, incoming in
-            // ...but never absorb from an entity a push has just deleted: mapping a
-            // deleted @Model traps.
-            if incoming > doc.updatedAt, let fresh = WorkoutDocument(fromLive: workout) {
+        .onChange(of: workout.isLive ? workout.updatedAt : nil) { _, incoming in
+            // ...and never absorb from an entity a push has just deleted: the observed
+            // expression above is evaluated on every body pass, so even it must be
+            // liveness-guarded — reading a persisted property on a dead @Model traps.
+            if let incoming, incoming > doc.updatedAt,
+               let fresh = WorkoutDocument(fromLive: workout) {
                 doc = fresh
             }
         }