add lifecycle run state

deploy/arm64-installer/.env.example

@@ -46,6 +46,9 @@ FAILURE_SNAPSHOT_RESET=1
 # 0: keep existing behavior.
 # 1: after one successful snapshot, allow at most N successful delta runs;
 #    the next run is forced to snapshot and active state/db is rebuilt from empty.
+# Lifecycle run state is persisted independently at:
+#   ${HOST_DATA_DIR}/state/run-lifecycle-state.json
+# It is not affected by run retention or state/db reset.
 PERIODIC_SNAPSHOT_RESET=0
 PERIODIC_SNAPSHOT_MAX_DELTAS=100
 DB_STATS_EXACT_EVERY=0