fix: keep workspace ls sizes schema-safe

inc/Workspace/WorkspaceReader.php

@@ -168,16 +168,19 @@ public function list_directory( string $name, ?string $path = null ): array|\WP_
 
 			$entry_path = $target_path . '/' . $entry;
 			$is_dir     = is_dir($entry_path);
+			$size       = 0;
+
+			if ( ! $is_dir && is_file($entry_path) ) {
+				$file_size = filesize($entry_path);
+				$size      = false === $file_size ? 0 : (int) $file_size;
+			}
 
 			$item = array(
 				'name' => $entry,
 				'type' => $is_dir ? 'directory' : 'file',
+				'size' => $size,
 			);
 
-			if ( ! $is_dir ) {
-				$item['size'] = filesize($entry_path);
-			}
-
 			$items[] = $item;
 		}
 

tests/smoke-workspace-list-directory.php

@@ -0,0 +1,104 @@
+<?php
+/**
+ * Smoke test for local workspace directory listing contract.
+ *
+ * Run: php tests/smoke-workspace-list-directory.php
+ */
+
+declare( strict_types=1 );
+
+namespace {
+    $workspace_root = sys_get_temp_dir() . '/dmc-workspace-list-directory';
+    if (! defined('ABSPATH') ) {
+        define('ABSPATH', $workspace_root . '/site/');
+    }
+    if (! defined('DATAMACHINE_WORKSPACE_PATH') ) {
+        define('DATAMACHINE_WORKSPACE_PATH', $workspace_root . '/workspace');
+    }
+
+    if (! class_exists('WP_Error') ) {
+        class WP_Error
+        {
+            public function __construct( private string $code, private string $message, private array $data = array() )
+            {
+            }
+
+            public function get_error_code(): string
+            {
+                return $this->code;
+            }
+            public function get_error_message(): string
+            {
+                return $this->message;
+            }
+            public function get_error_data(): array
+            {
+                return $this->data;
+            }
+        }
+    }
+
+    if (! function_exists('is_wp_error') ) {
+        function is_wp_error( $value ): bool
+        {
+            return $value instanceof WP_Error;
+        }
+    }
+
+    if (! function_exists('size_format') ) {
+        function size_format( $bytes ): string
+        {
+            return (string) $bytes . ' B';
+        }
+    }
+
+    include __DIR__ . '/../inc/Support/PathSecurity.php';
+    include __DIR__ . '/../inc/Workspace/Workspace.php';
+    include __DIR__ . '/../inc/Workspace/WorkspaceReader.php';
+
+    use DataMachineCode\Workspace\Workspace;
+    use DataMachineCode\Workspace\WorkspaceReader;
+
+    $failures = array();
+    $total    = 0;
+    $assert   = function ( string $label, bool $condition ) use ( &$failures, &$total ): void {
+        ++$total;
+        if ($condition ) {
+            echo "  ok {$label}\n";
+            return;
+        }
+        $failures[] = $label;
+        echo "  fail {$label}\n";
+    };
+
+    echo "Workspace list directory - smoke\n";
+
+    @mkdir(DATAMACHINE_WORKSPACE_PATH . '/example/src', 0777, true);
+    file_put_contents(DATAMACHINE_WORKSPACE_PATH . '/example/README.md', "hello\n");
+
+    $reader = new WorkspaceReader(new Workspace());
+    $list   = $reader->list_directory('example');
+
+    $entries = array();
+    if (! is_wp_error($list) ) {
+        foreach ( $list['entries'] as $entry ) {
+            $entries[$entry['name']] = $entry;
+        }
+    }
+
+    $assert('list directory succeeds', ! is_wp_error($list) && true === $list['success']);
+    $assert('directory entry includes integer size', isset($entries['src']) && 'directory' === $entries['src']['type'] && 0 === $entries['src']['size']);
+    $assert('file entry includes integer byte size', isset($entries['README.md']) && 'file' === $entries['README.md']['type'] && 6 === $entries['README.md']['size']);
+    $assert('every entry exposes schema-safe integer size', ! is_wp_error($list) && array_reduce($list['entries'], fn( bool $carry, array $entry ): bool => $carry && array_key_exists('size', $entry) && is_int($entry['size']), true));
+
+    if (! empty($failures) ) {
+        echo "\nFAIL: " . count($failures) . " assertion(s) failed out of {$total}\n";
+        foreach ( $failures as $failure ) {
+            echo "  - {$failure}\n";
+        }
+        exit(1);
+    }
+
+    echo "\nOK ({$total} assertions)\n";
+    exit(0);
+}