harden doc loader

src/Knowledge/Ingest/DocumentLoader.php

@@ -46,7 +46,7 @@ final class DocumentLoader
             $pdf = $parser->parseFile($path);
             $text = $pdf->getText();
         } catch (\Throwable $e) {
-            throw new \RuntimeException("Failed to parse PDF: {$path}", 0, $e);
+            throw new \RuntimeException("Failed to parse PDF: {$path}. Error: " . $e->getMessage(), 0, $e);
         }
 
         return $this->normalize($text);