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/Manual-Docker_Essentials.md

@@ -528,7 +528,17 @@ All scripts support these standard flags:
 |------|-------------|
 | `--dry-run` | Preview actions without making changes. Shows exactly what would happen. |
 | `--status` | Show current config, container states, and relevant runtime info, then exit. |
-| `--log` | Verbose output — full detail for every container checked and every decision made. |
+| `--log` | Verbose mode — adds per-container banners, action lines, pull output, and list details. |
+
+**Output tiers:** Scripts have two output levels. Without `--log`, each script processes
+silently and always concludes with a summary block: identity, duration, counts, and
+a status line. Per-container detail — individual container names, pull Status lines,
+skip reasons — only appears with `--log`. Warnings and errors are always visible
+regardless of `--log`.
+
+`docker_watchdog.sh` is the exception — it runs 96 cycles/day as a background daemon
+and is silent on clean cycles by design. Its summary block only fires when there are
+restarts or warnings. Use `--log` to see per-cycle detail on clean cycles.
 
 ### `docker_watchdog.sh --status` shows:
 Strike counts for all monitored containers, current skip list contents, whether grace