Two bugs fixed:
1. fields_autoplaced yes was always injected — caused incorrect visual
rendering of label text in KiCAD. Removed by using clone() which
copies an existing label without that field.
2. (justify left bottom) was hardcoded regardless of orientation.
For orientation 180/270 KiCAD requires (justify right bottom).
Now set correctly via new_label.effects.justify._tree[1].
Implementation switches from manual sexpdata list construction to
kicad-skip Schematic.label[0].clone(), which produces a structurally
correct label that KiCAD can round-trip without modification.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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