HybridChunker ignores layers in serialization params

[Vdaleke]

HybridChunker ignores layers in serialization params because the inner HierarchicalChunker does not pass them to iterate_items method:

docling-core/docling_core/transforms/chunker/hierarchical_chunker.py

Lines 171 to 174 in 0425dc0

	for item, level in dl_doc.iterate_items(
	with_groups=True,
	traverse_pictures=traverse_pictures,
	):

Related to docling-project/docling#1325

[dosubot]

Good catch — this looks like the same class of bug that was fixed for traverse_pictures in PR #518. In that PR, the fix was to extract the parameter from the serializer's params and pass it explicitly to iterate_items().

The iterate_items method already accepts an included_content_layers parameter [1], so the fix here would follow the same pattern: extract the layers from serialization params and pass them as included_content_layers in the iterate_items call at lines 171–174.

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