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/Status/PostScheduleAbility.php

@@ -8,10 +8,9 @@ use DateTimeImmutable;
 use DateTimeZone;
 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\ChangeLog\ChangeLog;
+use LIT\MCP\Integrations\WordPress\PostChangeResult;
 use LIT\MCP\Integrations\WordPress\PostGuard;
 use LIT\MCP\Integrations\WordPress\Schema\ContentSchema;
 use WP_Error;
@@ -128,33 +127,16 @@ final class PostScheduleAbility implements Ability
         }
 
         // The status change is saved – failures from here on are logged and reported as warnings only.
-        $warnings = [];
-        FollowUp::run(
-            fn () => do_action('lit_mcp_after_save', $postId, $this->name(), $input),
-            $this->name() . ' lit_mcp_after_save',
-            'Eine Erweiterung ist nach dem Planen auf einen Fehler gestoßen; die Änderung ist gespeichert.',
-            $warnings
-        );
-
+        $change = (new PostChangeResult($this->name(), $this->log, $postId))->afterSave($input, 'Planen');
         $title = (string) $post->post_title;
         $summary = sprintf('"%s" geplant für %s', $title, $raw)
             . ($post->post_status === 'publish' ? ' (war veröffentlicht und ist bis dahin offline)' : '');
-        $logId = FollowUp::run(
-            fn () => $this->log->record($this->name(), (string) $post->post_type, (string) $postId, $summary),
-            $this->name() . ' change log',
-            'Änderungsprotokoll konnte nicht geschrieben werden; die Änderung ist gespeichert.',
-            $warnings
-        );
+        $change->log((string) $post->post_type, $summary);
+        $updated = $change->reread($post) ?? $post;
 
-        $updated = get_post($postId);
-        $updated = $updated instanceof WP_Post ? $updated : $post;
-
-        return ToolResult::ok($summary . '.')
+        return $change->result($summary . '.', $updated)
             ->changed((string) $postId, (string) $post->post_type, 'scheduled', $title)
-            ->rev(Rev::ofPost($updated))
-            ->logId(is_int($logId) ? $logId : null)
             ->urls((string) get_preview_post_link($updated), (string) get_edit_post_link($postId, 'raw'))
-            ->warnings($warnings)
             ->toArray();
     }