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/programmatic-usage.md

@@ -1,7 +1,12 @@
-# Programmatic Usage
+# Java Programmatic Usage
 
 Radixor code and model data are separate runtime components. Every example on this page requires `org.egothor:radixor:<radixor-version>` as an `implementation` dependency and at least one model JAR as a runtime dependency. The core JAR contains no `stemmer.gz`.
 
+The Python implementation has its own native API. `pip install radixor` also
+installs the separate standard data package containing 20 precompiled models.
+See the [Python Quick Start](python/quick-start.md) and
+[Python Usage and API](python/usage.md).
+
 For complete dependency patterns, lifecycle guidance, and troubleshooting, use [Model Selection and Loading](model-selection-and-loading.md). The generated [model catalog](stemmer-model-catalog.md) records the current artifacts, versions, checksums, and provenance.
 
 ## 1. Minimal use: the Polish default