fix(document): select Office engines from declared native targets

scripts/smoke-python-runtime.py

@@ -805,7 +805,11 @@ def smoke_sdk_office(executable: Path) -> None:
             else:
                 shutil.copy2(source, destination)
         office = root / f"{stem}-office"
-        expected_backend = "wasm" if sys.platform == "linux" else "native"
+        adapter = office / "node_modules/@deepseek-ai/libreoffice-kit/package.json"
+        native = stem.removeprefix("deepseek-harness-sdk-runtime-").replace("win-", "win32-").replace("macos-", "darwin-")
+        declared = json.loads(adapter.read_text(encoding="utf-8")).get("optionalDependencies", {})
+        selected = native if f"@deepseek-ai/libreoffice-kit-{native}" in declared else "wasm"
+        expected_backend = "wasm" if selected == "wasm" else "native"
         engines = [
             json.loads(manifest.read_text())["engine"]["kind"]
             for manifest in (office / "node_modules/@deepseek-ai").glob("libreoffice-kit-*/prebuilds.json")