Header/code audit fixes across all core scripts

Behavior fixes:
- docker_daily_restart.sh: implement RESTART_VERIFY_WAIT sleep before
  verify_running() — variable was logged as config but never applied
- cert_monitor.sh: --log now shows expiry date and days remaining for
  healthy domains in the per-domain summary; problems always show details

Header corrections:
- downloaders_reset.sh: fix frequency contradiction (15 min → 30 min)
- lidarr_cleanup.sh: Emby scan triggers on actual deletions, not every run
- ssh_setup.sh: document --local-only flag in USAGE section
- zfs_memory_snapshot.sh: clarify dry-run skips log write in PURPOSE
- ramdisk_stop.sh / ramdisk_setup.sh: document TRANSCODE_STATE_FILE var
- smart_long_test.sh: remove SMART_TEMP_WARN/CRIT — not used in code

Monitors/zfs_memory_snapshot.sh

@@ -10,8 +10,9 @@
 # only — system_watchdog.sh handles threshold-based intervention.
 #
 # Combines ZFS pool status, ARC statistics, Docker memory usage, and kernel
-# memory pressure into a single snapshot. Output goes to both console (for User
-# Scripts output log) and ZFS_REPORT_LOG for week-over-week comparison.
+# memory pressure into a single snapshot. In normal mode output goes to both
+# console (for User Scripts output log) and ZFS_REPORT_LOG for week-over-week
+# comparison. In --dry-run mode, console only — nothing written to the log.
 #
 # ==============================================================================================
 # OPERATIONAL MODEL