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/landing-v2.js

@@ -0,0 +1 @@
+document.addEventListener("DOMContentLoaded",()=>{const b=document.querySelector(".rx2-menu"),n=document.querySelector(".rx2-nav");if(b&&n)b.addEventListener("click",()=>{const o=n.classList.toggle("open");b.setAttribute("aria-expanded",String(o));});document.querySelectorAll("[data-copy]").forEach(btn=>btn.addEventListener("click",async()=>{const el=document.getElementById(btn.dataset.copy);if(!el)return;try{await navigator.clipboard.writeText(el.innerText);const t=btn.textContent;btn.textContent="Copied";setTimeout(()=>btn.textContent=t,1200);}catch(e){}}));});