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.

Plugin/unraid/Partnership/containers.sh

@@ -3,15 +3,25 @@
 # ====================== Partnership — Unraid Container Adapter ================================
 # ==============================================================================================
 #
-# Sourced by partnership_onboard.sh and partnership_offboard.sh via:
+# PURPOSE
+# ─────────────────────────────────────────────────────────────────────────────
+# Platform adapter providing container deploy/cleanup functions for the Unraid
+# partnership system. Sourced (not executed) by partnership_onboard.sh and
+# partnership_offboard.sh via:
 #   source "$SCRIPTS_ROOT/Plugin/$PLATFORM/Partnership/containers.sh"
 #
-# Provides container deploy/cleanup functions specific to the Unraid platform:
-#   - Docker container deployment from Unraid CA XML templates
+# ==============================================================================================
+# OPERATIONAL MODEL
+# ==============================================================================================
 #
-# Functions use variables from the calling script's scope (sourced, not exec'd):
+# Functions operate on variables from the calling script's scope:
 #   MIRROR, MIRROR_IP, MIRROR_SSH_KEY, SSH_TIMEOUT, DRY_RUN, SCRIPTS_ROOT
 #
+# Capabilities:
+#   - Docker container deployment from Unraid CA XML templates
+#   - Remote GPU type detection (cached per session — one SSH call per onboard)
+#   - Deployed stack tracking via _STACK_DEPLOYED / _STACK_FAILED counters
+#
 # ==============================================================================================
 
 TEMPLATES_DIR="/boot/config/plugins/dockerMan/templates-user"