feat(cli): theme_vars_check manifest completeness + fileset integrity

- Verify required manifest fields: <name>, <element>, <author>, <creationDate>.
- Verify <scriptfile> target exists in src/.
- Fileset integrity: every <filename>/<folder> in <fileset> must exist in src/
  — catches the "Failed to find source folder" install failure class at CI time.

Authored-by: Moko Consulting

cli/theme_vars_check.php

@@ -137,6 +137,45 @@ if (is_file($manifest)) {
 
         isset($xml->dlid) ? $ok('<dlid> license-key field present')
             : $fail('<dlid prefix="dlid=" suffix=""/> is missing');
+
+        // Required manifest fields
+        foreach (['name', 'element', 'author', 'creationDate'] as $field) {
+            (isset($xml->$field) && trim((string) $xml->$field) !== '')
+                ? $ok("<$field> present")
+                : $fail("<$field> is missing or empty");
+        }
+
+        // scriptfile (if declared) must exist
+        if (isset($xml->scriptfile)) {
+            $sf = trim((string) $xml->scriptfile);
+            is_file("$src/$sf") ? $ok("scriptfile '$sf' present")
+                : $fail("<scriptfile> references '$sf' which is not in src/");
+        }
+
+        // Fileset integrity — every referenced file/folder must exist in src/
+        if (isset($xml->fileset)) {
+            $missingFs = [];
+            foreach ($xml->fileset->files as $files) {
+                $folder  = trim((string) ($files['folder'] ?? ''));
+                $baseDir = $folder !== '' ? "$src/$folder" : $src;
+                foreach ($files->filename as $fn) {
+                    $rel = ($folder !== '' ? "$folder/" : '') . trim((string) $fn);
+                    if (!is_file("$baseDir/" . trim((string) $fn))) { $missingFs[] = $rel; }
+                }
+                foreach ($files->folder as $fd) {
+                    $rel = ($folder !== '' ? "$folder/" : '') . trim((string) $fd) . '/';
+                    if (!is_dir("$baseDir/" . trim((string) $fd))) { $missingFs[] = $rel; }
+                }
+            }
+            if ($missingFs) {
+                $shown = array_slice($missingFs, 0, 10);
+                $more  = count($missingFs) - count($shown);
+                $fail('fileset references ' . count($missingFs) . ' missing path(s): '
+                    . implode(', ', $shown) . ($more > 0 ? " (+$more more)" : ''));
+            } else {
+                $ok('all fileset paths exist in src/');
+            }
+        }
     }
 }