Record original-alignment implementation and traceability checkpoint

Capture current source, content data, tests, asset licenses, and original-specification traceability. Original implementation remains incomplete. The accepted matching UI generation passed 154 suites and 12,253 checks, with eight rendered staff-contract screens reviewed. Latest native Windows and full-original acceptance remain outstanding.

scripts/core/domain_event_stream.gd

@@ -8,6 +8,8 @@ const MAX_BATCH_SIZE := 4_096
 
 var _subscribers: Dictionary = {}
 var _published_ids: Dictionary = {}
+var _snapshot_ids: Array[String] = []
+var _snapshot_ids_dirty := true
 var _recent_events: Array[SimulationDomainEvent] = []
 var _pending_deliveries: Array[SimulationDomainEvent] = []
 var _delivery_active := false
@@ -49,6 +51,8 @@ func publish_batch(events: Array) -> bool:
 			return false
 		batch_ids[event.event_id] = true
 		committed.append(event.copy())
+	if not committed.is_empty():
+		_snapshot_ids_dirty = true
 	for event: SimulationDomainEvent in committed:
 		_published_ids[event.event_id] = true
 		_recent_events.append(event.copy())
@@ -90,13 +94,13 @@ func recent_events() -> Array[SimulationDomainEvent]:
 	return result
 
 func create_snapshot() -> Dictionary:
-	var published_ids: Array = _published_ids.keys()
-	published_ids.sort_custom(func(left: Variant, right: Variant) -> bool:
-		return String(left) < String(right)
-	)
-	var saved_ids: Array[String] = []
-	for event_id: Variant in published_ids:
-		saved_ids.append(String(event_id))
+	if _snapshot_ids_dirty:
+		_snapshot_ids.clear()
+		for event_id: Variant in _published_ids:
+			_snapshot_ids.append(String(event_id))
+		_snapshot_ids.sort()
+		_snapshot_ids_dirty = false
+	var saved_ids: Array[String] = _snapshot_ids.duplicate()
 	var saved_recent: Array[Dictionary] = []
 	for event in _recent_events:
 		saved_recent.append(event.to_dictionary())
@@ -131,6 +135,7 @@ func restore_snapshot(snapshot: Dictionary) -> bool:
 	if restored_recent.size() > RECENT_EVENT_LIMIT:
 		return false
 	_published_ids = restored_ids
+	_snapshot_ids_dirty = true
 	_recent_events = restored_recent
 	_pending_deliveries.clear()
 	return true