Docker_Essentials echo/log audit pass — all 8 scripts + Manual

Consistent two-tier output model across the entire folder:
- Per-container banners, action lines, and list details → log (ENABLE_LOGGING=true only)
- Section headers, summaries, counts, and status conclusions → echo (always visible)
- Warnings and errors always visible regardless of log setting
- Blank echo lines inside loops removed

All scripts: added Lock Acquisition and Host Detection entries to OPERATIONAL SAFEGUARDS.

Setup banners removed from docker_watchdog.sh, docker_weekly_restart.sh,
downloaders_reset.sh (noise before any work happens).

docker_watchdog.sh: removed success "Running as root" / "Docker found" setup lines;
info() → log() for daemon-recovered and per-cycle header; removed per-cycle echo separator.

docker_update.sh + docker_update_remaining.sh: docker pull stdout suppressed when
ENABLE_LOGGING=false to prevent orphaned Status: lines appearing without container context;
restructured pull block to use PIPESTATUS for exit code capture.

downloaders_reset.sh: 11× info() → log() for all per-item API operation lines.

docker_weekly_restart.sh: removed duplicate restart-order echo (build_restart_order
already logs it internally).

Manual-Docker_Essentials.md: documented the two-tier output model and watchdog
silent-when-healthy exception in the flag reference section.

Docker_Essentials/docker_network_connect.sh

@@ -51,6 +51,14 @@
 # OPERATIONAL SAFEGUARDS
 # ==============================================================================================
 #
+# Lock Acquisition
+#   Prevents concurrent execution via acquire_lock(). Safe to call from
+#   array start hooks or manually without risk of overlap.
+#
+# Host Detection
+#   detect_hosts() identifies which server is running the script and aliases
+#   HOST*_NETWORK_CONNECT_* arrays to the correct host's values.
+#
 # Docker Daemon Check
 #   Verifies daemon is responsive before any network operations. Network
 #   commands against a hung daemon hang indefinitely.
@@ -282,7 +290,7 @@ elif [[ ${#FAILED[@]} -gt 0 ]]; then
 elif [[ ${#NETWORKS_CREATED[@]} -gt 0 ]]; then
     warn "Networks recreated — ${NETWORKS_CREATED[*]} — unRAID update likely wiped them"
 else
-    log "All networks healthy — no action needed"
+    echo "All networks healthy — no action needed"
 fi
 echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"