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generate(angle, size) -> str (self-contained SVG)
- Cream semicircle face with an ink outline.
- Steel-blue degree ticks around the arc; minors every 10 deg,
longer majors with numeric labels every 30 deg.
- Gold horizontal baseline through the centre.
- Crimson ray from the centre at the given `angle` (0-180, measured
anticlockwise from the right-hand baseline, standard protractor).
- D0ACAC rounded border frame; CSS-var style block.
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Returns (parts, cx, cy, R, width, height) so callers can append rays
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rays : list of dicts {"angle": float (0-180), "label": str}. Up to 6.
Backward-compatible companion to generate(angle=..).
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