Bring script headers onto the template and close safeguard gaps

Headers claimed protections the code never had, and several destructive paths had no
guard against a collapsed config value.

Monitors/emby_session_report.sh

@@ -18,6 +18,22 @@
 # configuration issue. Silent on clean runs.
 #
 # ==============================================================================================
+# OPERATIONAL MODEL
+# ==============================================================================================
+#
+#   1. Reachability — Emby API responding; unreachable exits cleanly rather than
+#      reporting an empty library as a real result
+#   2. Server info and uptime
+#   3. Active sessions — count, and the transcode-to-direct-play ratio
+#   4. Library counts — movies, episodes, songs
+#   5. Activity history over the last EMBY_REPORT_DAYS
+#   6. Top EMBY_REPORT_TOP_N items and most active users
+#   7. Ramdisk transcode status, read from the shared transcode state
+#
+# Every figure is queried fresh. The only notification is the transcode-ratio warning;
+# everything else is report output.
+#
+# ==============================================================================================
 # DESIGN PRINCIPLES
 # ==============================================================================================
 #
@@ -54,9 +70,6 @@
 #   detect_hosts() aliases HOST*_EMBY_URL and HOST*_EMBY_API_KEY → EMBY_URL / EMBY_API_KEY.
 #   Each server reports on its own Emby instance automatically.
 #
-# Notification Validated
-#   platform_require_cmd confirms the notify script is present before use.
-#
 # ==============================================================================================
 # CONFIGURATION
 # ==============================================================================================