Make fallback coverage something that can actually happen, and say so on the page

fallback.sh starts covered containers with docker start and never creates them, so a coverage list
the partner has never been sent is a promise nothing can keep — all twelve were missing. Adds the
push and remove paths, a readiness card that checks rather than infers, and the fallback state the
assistant needs to answer for it.

Plugin/unraid/include/ai_profiles.php

@@ -116,7 +116,7 @@ const VV_AI_PROFILES_DEF = [
         // system_state is read-only and shared with repair. Both need to know a container is down
         // or a pool is full to explain anything about this machine rather than about Unraid in
         // general; neither gets a way to act on it, and only repair can change a setting.
-        'caps'  => ['retrieve', 'health', 'system_state', 'run_evidence', 'scoped_log',
+        'caps'  => ['retrieve', 'health', 'system_state', 'fallback_state', 'run_evidence', 'scoped_log',
                     'incidents', 'conf_lookup', 'file_bugs'],
     ],
     // The only profile that may change a setting, and the only one not offered as a button.
@@ -136,7 +136,7 @@ const VV_AI_PROFILES_DEF = [
         'hint'  => 'Works through a finding with you, and can apply a fix you approve.',
         'turns' => 3,
         'ui'    => false,
-        'caps'  => ['retrieve', 'health', 'system_state', 'run_evidence', 'scoped_log', 'incidents',
+        'caps'  => ['retrieve', 'health', 'system_state', 'fallback_state', 'run_evidence', 'scoped_log', 'incidents',
                     'conf_lookup', 'conf_write', 'probe', 'file_findings', 'phrasebook', 'past_fixes'],
     ],
 ];
@@ -148,6 +148,7 @@ const VV_AI_CAP_MEANING = [
     'kind_filter'  => 'the retrieval kind filter the page exposes',
     'health'       => 'live health sweep measured at question time — the AI subsystem only',
     'system_state' => 'read-only view of the machine: hardware, containers, pools, array, UPS',
+    'fallback_state' => 'whether a failover would actually work: state, tiers, and whether the partner really has the covered containers',
     'run_evidence' => 'run record and log tail for a script named in the question',
     'scoped_log'   => 'log tail for whatever the operator currently has open',
     'incidents'    => 'operator-written history of what previously went wrong with this thing',