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

docs/integration-deep-dive.md

@@ -1,4 +1,4 @@
-# Integration Deep Dive
+# Java Integration Deep Dive
 
 This page explains how to integrate Radixor into a real Java application after the first
 fast-track experiment works. It covers dependencies, external model artifacts, runtime lifecycle,