Summary

• Fix _merge_table_chunks() to merge only top-level rows from each chunk HTML table.
• Prevent nested table rows from being hoisted into the reconstructed root table.
• Add regression coverage to verify nested table structure is preserved.

Finding Reference

• feat: tablechunks can reconstruct table #4291 (comment)

Validation

• unset VIRTUAL_ENV && CI=false uv run --no-sync pytest -q test_unstructured/chunking/test_base.py -k "reconstruct_tables_from_a_mixed_element_list or preserves_nested_table_structure" --maxfail=1
• unset VIRTUAL_ENV && CI=false uv run --no-sync pytest -q test_unstructured/chunking/test_base.py test_unstructured/chunking/test_dispatch.py --maxfail=1
• `unset VIRTUAL_ENV && uv run --no-sync python - <<'PY'
  from unstructured.partition.text import partition_text

elements = partition_text(text="Codex initializer smoke test")
assert elements, "partition_text returned no elements"
print(f"partition_text smoke check passed ({len(elements)} elements)")
PY`

• unset VIRTUAL_ENV && CI=false uv run --no-sync pytest -q test_unstructured/partition/test_text.py --maxfail=1

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