Add missing RUNTIME MODES section, document --log

arr_cache_prefill.sh had no RUNTIME MODES section at all; arr_full_rescan.sh
had one but didn't mention --log despite supporting it via parse_args.
Comment-only.

Arrs_Stack/arr_cache_prefill.sh

@@ -62,6 +62,24 @@
 #   not a job that fires every half hour.
 #
 # ==============================================================================================
+# RUNTIME MODES
+# ==============================================================================================
+#
+# arr_cache_prefill.sh
+#     Normal run — populates all three arr caches, or skips cleanly per-arr as described
+#     under OPERATIONAL SAFEGUARDS above. No --dry-run/--status mode: this script only ever
+#     reads and writes cache, there's no destructive action to preview and no separate state
+#     worth inspecting beyond the cache files themselves (see Tools/arr_rescan_monitor.sh
+#     --status for cache age/active-rescan inspection).
+#
+# arr_cache_prefill.sh --log
+#     Verbose — per-arr detail as each one is checked/fetched/skipped.
+#
+# arr_cache_prefill.sh ARR_PREFILL_WAIT_MINUTES=1
+#     Override the reachability-retry ceiling for this run only (parse_args VAR=VAL
+#     mechanism) — this is how CRITICAL_MAINTENANCE_SCRIPTS invokes it every 30min.
+#
+# ==============================================================================================
 
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 

Arrs_Stack/arr_full_rescan.sh

@@ -57,6 +57,7 @@
 #
 #   arr_full_rescan.sh              — normal run
 #   arr_full_rescan.sh --dry-run    — preview which arrs would be rescanned, trigger nothing
+#   arr_full_rescan.sh --log        — verbose, per-arr detail
 #
 # ==============================================================================================