feat: Divi tools write library entries; global ones with dry run, confirm and backup (E2, F2)

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/Abilities/ExposurePolicy.php

@@ -181,6 +181,12 @@ final class ExposurePolicy
         return isset($this->readonlyGroups[$group]);
     }
 
+    /** Whether abilities of $group may write: the group is neither "nur lesen" nor disabled as a whole. */
+    public function groupWritable(string $group): bool
+    {
+        return ! $this->isReadonly($group) && $this->groupMode($group) !== self::DISABLED;
+    }
+
     /**
      * Whether $group is switched on at all: not disabled as a whole ("nur lesen" still reads). The
      * group "Divi-Bibliothek" disabled hides library entries from the Divi read tools (ruling P9).