Nomad changes

fixtures/format_specific/format_pptx.json

@@ -0,0 +1,26 @@
+{
+  "id": "format_pptx",
+  "category": "format_specific",
+  "description": "PPTX presentation extraction using extract_file_sync",
+  "tags": [
+    "format_specific",
+    "pptx",
+    "text_extraction"
+  ],
+  "call": "extract_file_sync",
+  "input": {
+    "path": "pptx/simple.pptx",
+    "mime_type": "application/vnd.openxmlformats-officedocument.presentationml.presentation"
+  },
+  "assertions": [
+    {
+      "type": "not_error"
+    }
+  ],
+  "skip": {
+    "languages": [
+      "wasm"
+    ],
+    "reason": "WASM cannot access filesystem; use extractBytes with file content instead"
+  }
+}