refactor: PostChangeResult for the after-save block of the post tools

after_save hook, re-read, change log and ToolResult (rev, log_id, warnings)
were repeated in nine post abilities; they now share one helper. Behaviour
and warning texts are unchanged.

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

src/Integrations/WordPress/Content/ContentCreateAbility.php

@@ -6,11 +6,10 @@ namespace LIT\MCP\Integrations\WordPress\Content;
 
 use LIT\MCP\Abilities\Ability;
 use LIT\MCP\Abilities\Errors;
-use LIT\MCP\Abilities\FollowUp;
-use LIT\MCP\Abilities\Rev;
 use LIT\MCP\Abilities\ToolResult;
 use LIT\MCP\Abilities\WriteFailed;
 use LIT\MCP\ChangeLog\ChangeLog;
+use LIT\MCP\Integrations\WordPress\PostChangeResult;
 use LIT\MCP\Integrations\WordPress\PostGuard;
 use LIT\MCP\Integrations\WordPress\Schema\ContentSchema;
 use Throwable;
@@ -136,29 +135,15 @@ final class ContentCreateAbility implements Ability
     private function result(int $postId, string $postType, array $input, array $warnings): array
     {
         // The draft is saved – failures from here on are logged and reported as warnings only.
-        FollowUp::run(
-            fn () => do_action('lit_mcp_after_save', $postId, $this->name(), $input),
-            $this->name() . ' lit_mcp_after_save',
-            'Eine Erweiterung ist nach dem Speichern auf einen Fehler gestoßen; der Entwurf ist gespeichert.',
-            $warnings
-        );
-
-        $post = get_post($postId);
+        $change = (new PostChangeResult($this->name(), $this->log, $postId, 'der Entwurf', $warnings))
+            ->afterSave($input);
+        $post = $change->reread();
         $title = $post instanceof WP_Post ? (string) $post->post_title : (string) $input['title'];
-        $summary = sprintf('Entwurf "%s" angelegt', $title);
-        $logId = FollowUp::run(
-            fn () => $this->log->record($this->name(), $postType, (string) $postId, $summary),
-            $this->name() . ' change log',
-            'Änderungsprotokoll konnte nicht geschrieben werden; der Entwurf ist gespeichert.',
-            $warnings
-        );
+        $change->log($postType, sprintf('Entwurf "%s" angelegt', $title));
 
-        return ToolResult::ok(sprintf('"%s" als Entwurf angelegt (ID %d).', $title, $postId))
+        return $change->result(sprintf('"%s" als Entwurf angelegt (ID %d).', $title, $postId), $post)
             ->changed((string) $postId, $postType, 'created', $title)
-            ->rev($post instanceof WP_Post ? Rev::ofPost($post) : null)
-            ->logId(is_int($logId) ? $logId : null)
             ->urls((string) get_preview_post_link($postId), (string) get_edit_post_link($postId, 'raw'))
-            ->warnings($warnings)
             ->toArray();
     }