Nomad changes

docs/snippets/python/config/pdf_hierarchy_config.md

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+```python title="Python"
+from kreuzberg import extract_file_sync, ExtractionConfig, PdfConfig, HierarchyConfig
+
+config: ExtractionConfig = ExtractionConfig(
+    pdf_options=PdfConfig(
+        extract_metadata=True,
+        hierarchy=HierarchyConfig(
+            enabled=True,
+            k_clusters=6,
+            include_bbox=True,
+            ocr_coverage_threshold=0.8
+        )
+    )
+)
+
+result = extract_file_sync("document.pdf", config=config)
+
+# Access hierarchy information
+for page in result.pages or []:
+    print(f"Page {page.page_number}:")
+    print(f"  Content: {page.content[:100]}...")
+```