fix: content-create with divi returns the Visual Builder edit_url (review I-1)

DiviPage::builderUrl() is shared by DiviPage::editUrl() and the content
composer, which now returns edit_url; content-create without divi keeps
the wp-admin link. divi-write-smoke checks the builder URL and, new in
section 9, the M1/M2 gates live (raw Divi markup refused; Divi read-only
stops content-create divi and execute-ability lit/divi-insert).

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01At3V6SjwbMe6eMzVGW3Hs7

src/Integrations/WordPress/Content/ContentComposer.php

@@ -41,7 +41,8 @@ interface ContentComposer
      * lit/content-create delete the draft again.
      *
      * @param list<mixed> $sections
-     * @return array{warnings: list<string>, outline: ?string}|WP_Error
+     * @return array{warnings: list<string>, outline: ?string, edit_url?: string}|WP_Error edit_url: where
+     *         the new content is edited (e.g. the Divi builder) instead of the WordPress editor.
      * @throws Throwable When storing failed.
      */
     public function write(int $postId, string $postType, array $sections): array|WP_Error;

src/Integrations/WordPress/Content/ContentCreateAbility.php

@@ -167,7 +167,7 @@ final class ContentCreateAbility implements Ability
 
         $warnings = array_merge($prepared['warnings'], $layout['warnings'] ?? []);
 
-        return $this->result($postId, $postType, $input, $warnings, $layout['outline'] ?? null);
+        return $this->result($postId, $postType, $input, $warnings, $layout);
     }
 
     /**
@@ -220,10 +220,10 @@ final class ContentCreateAbility implements Ability
     /**
      * @param array<string, mixed> $input
      * @param list<string>         $warnings
-     * @param string|null          $outline  Divi outline of the new layout (with divi only).
+     * @param array<string, mixed>|null $layout What the composer wrote (with divi only): outline, edit_url.
      * @return array<string, mixed>
      */
-    private function result(int $postId, string $postType, array $input, array $warnings, ?string $outline): array
+    private function result(int $postId, string $postType, array $input, array $warnings, ?array $layout): array
     {
         // The draft is saved – failures from here on are logged and reported as warnings only.
         $change = (new PostSaveFollowUp($this->name(), $this->log, $postId, 'der Entwurf', $warnings))
@@ -234,10 +234,13 @@ final class ContentCreateAbility implements Ability
 
         $result = $change->result(sprintf('"%s" als Entwurf angelegt (ID %d).', $title, $postId), $post)
             ->changed((string) $postId, $postType, 'created', $title)
-            ->urls((string) get_preview_post_link($postId), (string) get_edit_post_link($postId, 'raw'));
+            ->urls(
+                (string) get_preview_post_link($postId),
+                (string) ($layout['edit_url'] ?? get_edit_post_link($postId, 'raw'))
+            );
         if (array_key_exists('divi', $input)) {
             // The Divi tools lock on tree_rev (ruling P16): the next lit-divi-* call can use it right away.
-            $result->outline($outline)
+            $result->outline(isset($layout['outline']) ? (string) $layout['outline'] : null)
                 ->with('tree_rev', Rev::of($post instanceof WP_Post ? (string) $post->post_content : ''));
         }