Add ComfyUI custom node: LSD-detected open curve smoothed via DCT

Detects line segments with LSD (falling back to FLD when unavailable),
chains them into a single polyline, and truncates its DCT coefficients
to produce a smoothed/compressed curve, output as both an image and JSON.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

__init__.py

@@ -0,0 +1,3 @@
+from .lsd_dct_curve import NODE_CLASS_MAPPINGS, NODE_DISPLAY_NAME_MAPPINGS
+
+__all__ = ["NODE_CLASS_MAPPINGS", "NODE_DISPLAY_NAME_MAPPINGS"]