test and update numpy version constraint

Author: energyscholar

pyproject.toml

@@ -11,7 +11,7 @@ readme = "README.md"
 requires-python = ">=3.9"
 dependencies = [
     "pandas>=1.3.0",
-    "numpy>=1.26.0,<2.0",  # 1.26 is oldest with 3.12 wheels; <2.0 avoids breaking changes
+    "numpy>=1.26.0",  # tested compatible with numpy 2.x + EntropyHub
     "plotly>=4.0.0",
     "lmfit>=1.0.0",
     "arch>=6.2",  # 6.2 is oldest with compiled 3.12 wheels