Builds on core class updates described in other pull request. Refactored graph viz modules, fixed minor bugs in core classes

.gitignore

@@ -1,3 +1,6 @@
+.claude/*
+/build/*
+.venv/*
 /venv/
 /.idea/
 /.vscode/

hypergraphx/__init__.py

@@ -1,7 +1,19 @@
-from hypergraphx.core.directed_hypergraph import DirectedHypergraph
-from hypergraphx.core.hypergraph import Hypergraph
-from hypergraphx.core.multiplex_hypergraph import MultiplexHypergraph
-from hypergraphx.core.temporal_hypergraph import TemporalHypergraph
+# Core interfaces
+from hypergraphx.core.IHypergraph import IHypergraph
+from hypergraphx.core.IUndirectedHypergraph import IUndirectedHypergraph
+
+# Core classes
+from hypergraphx.core.Hypergraph import Hypergraph
+from hypergraphx.core.DirectedHypergraph import DirectedHypergraph
+from hypergraphx.core.MultiplexHypergraph import MultiplexHypergraph
+from hypergraphx.core.TemporalHypergraph import TemporalHypergraph
+
+# Visualization interface
+from hypergraphx.viz.IHypergraphVisualizer import IHypergraphVisualizer
+
+# Visualization class
+from hypergraphx.viz.HypergraphVisualizer import HypergraphVisualizer
+
 from . import readwrite
 
 import sys