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/assets/javascripts/mermaid.js

@@ -0,0 +1,14 @@
+const renderRadixorDiagrams = () => {
+  mermaid.initialize({
+    startOnLoad: false,
+    theme: "neutral",
+    flowchart: { htmlLabels: true, useMaxWidth: true },
+  });
+  return mermaid.run({ querySelector: ".mermaid" });
+};
+
+if (typeof document$ === "undefined") {
+  document.addEventListener("DOMContentLoaded", renderRadixorDiagrams);
+} else {
+  document$.subscribe(renderRadixorDiagrams);
+}