Implemented the `SynastryCalculator` to generate astrological
compatibility reports (synastry) between two subjects, outputting
results as a localized JSON string. Added the `NatalChartImageNode`
to generate an SVG natal wheel, convert it using `cairosvg`, and
format it as a ComfyUI `IMAGE` tensor.
Exported all five nodes in `__init__.py`, added `cairosvg` and `Pillow`
to `requirements.txt`, documented the repository with a comprehensive
README, and initialized a `workflows` directory.
Meisoftcoltd
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