Add full banner headers to all scripts across the codebase

Every script now has the established header format: PURPOSE with ─────── separator,
OPERATIONAL MODEL, DESIGN PRINCIPLES, OPERATIONAL SAFEGUARDS, CONFIGURATION, and
RUNTIME MODES — structured with full ====== banner sections throughout.

Orchestrators converted from compact ── inline format to full banners. Stale
emby-fallback and dirty sync references removed from Plugin/user_script_plug-in.sh.

Docker_Essentials/docker_weekly_restart.sh

@@ -16,6 +16,26 @@
 # stopped → leave, missing → skip. Container state is always respected.
 #
 # ==============================================================================================
+# DESIGN PRINCIPLES
+# ==============================================================================================
+#
+# Weekly Cadence
+#   Weekly restarts target services that accumulate state on a slower schedule
+#   than daily targets — less-critical containers that benefit from a periodic
+#   clean start but do not need nightly intervention. Daily restarts handle
+#   high-churn containers; weekly handles the longer-cycle ones.
+#
+# State Respect
+#   Running containers are restarted. Stopped containers are left stopped — they
+#   were intentionally halted and this script has no authority to override that
+#   decision. This rule is consistent across the entire ecosystem.
+#
+# Dependency-Safe Ordering
+#   Restarts follow the same dependency ordering used by docker_watchdog.sh.
+#   Services that other containers depend on restart first. A dependent is never
+#   restarted while its dependency is still coming up.
+#
+# ==============================================================================================
 # OPERATIONAL SAFEGUARDS
 # ==============================================================================================
 #