Drop state_size_bytes from ActivityExecutionInfo, ActivityListInfo, NexusOperationInfo

Reserve the field numbers for wire compatibility.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: stephanos

temporal/api/activity/v1/message.proto

@@ -151,9 +151,6 @@ message ActivityExecutionInfo {
     // Incremented each time the activity's state is mutated in persistence.
     int64 state_transition_count = 27;
 
-    // Updated once on scheduled and once on terminal status.
-    int64 state_size_bytes = 28;
-
     temporal.api.common.v1.SearchAttributes search_attributes = 29;
     temporal.api.common.v1.Header header = 30;
     // Metadata for use by user interfaces to display the fixed as-of-start summary and details of the activity.
@@ -189,8 +186,6 @@ message ActivityExecutionListInfo {
     string task_queue = 8;
     // Updated on terminal status.
     int64 state_transition_count = 9;
-    // Updated once on scheduled and once on terminal status.
-    int64 state_size_bytes = 10;
     // The difference between close time and scheduled time.
     // This field is only populated if the activity is closed.
     google.protobuf.Duration execution_duration = 11;

temporal/api/nexus/v1/message.proto

@@ -357,9 +357,7 @@ message NexusOperationExecutionListInfo {
 
     // Updated on terminal status.
     int64 state_transition_count = 10;
-    // Updated once on scheduled and once on terminal status.
-    int64 state_size_bytes = 11;
     // The difference between close time and scheduled time.
     // This field is only populated if the operation is closed.
-    google.protobuf.Duration execution_duration = 12;
+    google.protobuf.Duration execution_duration = 11;
 }