feat: lit/tb-activate – the explicit switch, always a dry run first (answer F1)

- only _et_enabled; dry run in both directions lists conditions, exclusions,
  layouts, overlaps and possible overlaps (B9); confirm: true switches
- enabling needs conditions and published layouts (B10); a detached
  template needs reattach first; the default template is refused
- the off-switch reaches an attached, enabled template outside publish,
  e.g. in the trash (ruling Q16); result names the fast way back
- every switch in the change log; failed switch rolled back

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

src/Integrations/Divi/ThemeBuilder/ThemeBuilderIntegration.php

@@ -53,6 +53,7 @@ final class ThemeBuilderIntegration implements Integration
             new TbListAbility($this->access, $conditions),
             new TbCreateTemplateAbility($this->access, $conditions, $this->composition, $this->saver, $this->log),
             new TbAssignAbility($this->access, $conditions, $this->log),
+            new TbActivateAbility($this->access, $conditions, $this->log),
         ];
     }
 }