Fallback echo/log audit pass — fallback.sh, fallback_test.sh + Manual

Remove setup banners from fallback.sh and fallback_test.sh. Add Host Detection
to fallback.sh OPERATIONAL SAFEGUARDS; add Lock Acquisition + Host Detection to
fallback_test.sh. Add output tiers section to Manual-Fallback.md documenting
daemon vs one-shot output behaviour.

Fallback/Manual-Fallback.md

@@ -568,6 +568,24 @@ If it has happened:
 
 ---
 
+## ━━━ OUTPUT TIERS ━━━
+
+Both scripts have two output levels controlled by `--log`.
+
+**fallback.sh** — daemon, runs continuously. Without `--log`, only state transitions,
+warnings, errors, and the startup banner are visible. Per-cycle detail (ping results,
+state evaluation) is suppressed — the daemon runs every 15–30 seconds and clean cycles
+produce no output by design. State transitions are always visible because they are the
+events that matter. Use `--log` when debugging why the state machine is or is not
+acting.
+
+**fallback_test.sh** — one-shot test harness. Without `--log`, phase headers, pass/fail
+results, and the final test report are always visible. Per-container checks within each
+phase are suppressed. With `--log`, every check in every phase is shown. Warnings and
+errors are always visible regardless of `--log`.
+
+---
+
 ## ━━━ FLAG REFERENCE ━━━
 
 ### fallback.sh