feat(python): add native distribution and release infrastructure

- add the Rust-backed Python API with PyStemmer compatibility
- distribute standard compiled models as a separate Python package
- generate model artifacts during builds instead of storing them in Git
- add GitHub release and Pages-backed package index workflows
- add Python tests, benchmarks, documentation, and Gradle integration
- refresh the documentation site, branding, and language benchmarks

python/.gitignore

@@ -0,0 +1,23 @@
+# Rust and maturin build products
+/target/
+**/dist/
+/models-standard/build/
+/radixor/models/
+*.so
+*.egg-info/
+
+# Standard-model payload is generated deterministically below the repository
+# build directory and belongs only in the published wheel/sdist.
+/models-standard/radixor_models_standard/manifest.json
+/models-standard/radixor_models_standard/models/*.rxc
+/models-standard/radixor_models_standard/notices/*/NOTICE-model-data.txt
+
+# Local Python environments and caches
+.venv/
+__pycache__/
+*.py[cod]
+.pytest_cache/
+
+# Reports produced by direct benchmark-script runs
+/benchmarks/results*.csv
+/benchmarks/results*.json