refactor: ChangeLog::recordPartial and column-size truncation

recordPartial() replaces the partial-log FollowUp blocks in content-create,
content-update and post-replace-with-copy; record() truncates ability,
object_type and object_id to their column sizes.

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

src/ChangeLog/ChangeLog.php

@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace LIT\MCP\ChangeLog;
 
+use LIT\MCP\Abilities\FollowUp;
 use LIT\MCP\Server\RequestContext;
 
 /**
@@ -44,9 +45,9 @@ class ChangeLog
                 'created_at' => current_time('mysql', true),
                 'user_id' => get_current_user_id(),
                 'client' => $this->sanitizedClientName(),
-                'ability' => $ability,
-                'object_type' => $objectType,
-                'object_id' => $objectId,
+                'ability' => mb_substr($ability, 0, 100),
+                'object_type' => mb_substr($objectType, 0, 50),
+                'object_id' => mb_substr($objectId, 0, 191),
                 'summary' => mb_substr($summary, 0, 500),
                 'revision_id' => $revisionId,
                 'snapshot_id' => $snapshotId,
@@ -64,6 +65,27 @@ class ChangeLog
         return (int) $wpdb->insert_id;
     }
 
+    /**
+     * Logs a write that failed and could not be rolled back completely (result "partial").
+     * Never throws: the caller is already reporting an error, a log failure only goes to
+     * the PHP error log.
+     */
+    public function recordPartial(
+        string $ability,
+        string $objectType,
+        string $objectId,
+        string $summary,
+        ?int $revisionId = null
+    ): void {
+        $ignored = [];
+        FollowUp::run(
+            fn () => $this->record($ability, $objectType, $objectId, $summary, $revisionId, null, 'partial'),
+            $ability . ' change log',
+            '',
+            $ignored
+        );
+    }
+
     public function purgeOlderThan(int $days): int
     {
         $wpdb = $this->db();