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>

tests/Unit/Integrations/Divi/ThemeBuilder/ThemeBuilderAccessTest.php

@@ -202,4 +202,43 @@ final class ThemeBuilderAccessTest extends TestCase
         self::assertToolError($hidden, 'not_found');
         self::assertSame(self::clientError($missing), self::clientError($hidden));
     }
+
+    /**
+     * Ruling Q16: Divi renders an attached, enabled template whatever its post status (B8) – the off-switch
+     * (offSwitch: true) reaches it in the trash; everything else about it reads like a missing template.
+     */
+    public function testTheOffSwitchReachesALiveTemplateOutsidePublish(): void
+    {
+        $trashed = ThemeBuilderFixtures::template(1066, ['enabled' => true, 'status' => 'trash']);
+        $input = ['template_id' => 1066, 'template_rev' => $trashed->rev()];
+        LibraryFixtures::given([ThemeBuilderFixtures::templatePost(1066, ['post_status' => 'trash'])]);
+        $access = ThemeBuilderFixtures::access([], true, ThemeBuilderFixtures::store([$trashed]));
+
+        self::assertSame($trashed, $access->changeableTemplate($input, true));
+        $missing = $access->changeableTemplate($input);
+        self::assertToolError($missing, 'not_found');
+
+        $notLive = [
+            ThemeBuilderFixtures::access([], true, ThemeBuilderFixtures::store([], 0, [], [$trashed])),
+            ThemeBuilderFixtures::access([], true, ThemeBuilderFixtures::store([
+                ThemeBuilderFixtures::template(1066, ['status' => 'trash']),
+            ])),
+            ThemeBuilderFixtures::access(['theme_builder'], true, ThemeBuilderFixtures::store([$trashed])),
+        ];
+        foreach ($notLive as $index => $other) {
+            $refused = $other->changeableTemplate($input, true);
+            self::assertToolError($refused, 'not_found', (string) $index);
+            self::assertSame(self::clientError($missing), self::clientError($refused), (string) $index);
+        }
+
+        self::assertToolError(
+            ThemeBuilderFixtures::access([], false, ThemeBuilderFixtures::store([$trashed]))->changeableTemplate($input, true),
+            'forbidden'
+        );
+        self::assertToolError(
+            ThemeBuilderFixtures::access([], true, ThemeBuilderFixtures::store([$trashed]))
+                ->changeableTemplate(['template_id' => 1066, 'template_rev' => 'alt'], true),
+            'rev_mismatch'
+        );
+    }
 }