Rename classifiers/ package to models/

Aligns module naming with the upcoming classification_neural lab,
which will use the same models/ package convention.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

pyproject.toml

@@ -16,4 +16,4 @@ requires = ["hatchling"]
 build-backend = "hatchling.build"
 
 [tool.hatch.build.targets.wheel]
-packages = ["cli", "classifiers"]
+packages = ["cli", "models"]