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/python/fast-track.md

@@ -0,0 +1,66 @@
+# Python Fast Track
+
+This is the shortest path from an empty Python environment to a working
+Radixor stemmer. The installation includes the native runtime and the separate
+standard-model package with 20 precompiled language models.
+
+## 1. Install
+
+=== "PyPI"
+
+    ```bash
+    python -m pip install --only-binary=:all: radixor
+    ```
+
+=== "GitHub Releases"
+
+    ```bash
+    python -m pip install --only-binary=:all: \
+      --index-url https://leogalambos.github.io/Radixor/python/simple/ radixor
+    ```
+
+PyPI publication is pending, and the GitHub index becomes live with the first
+Python releases. Until then, follow the source-checkout procedure on
+[Installation and Builds](installation.md).
+
+Radixor supports CPython 3.9 and newer. A JVM, Java dependency, and source
+dictionary are not required.
+
+## 2. Stem words
+
+```python
+from radixor import Stemmer
+
+stemmer = Stemmer("en")
+
+print(stemmer.stem("running"))
+print(stemmer.stem_batch(["running", "studies", "cars"]))
+```
+
+Expected first output:
+
+```text
+run
+```
+
+`stem()` and `stem_batch()` preserve Radixor's original API: a word for which
+the trie finds no patch command produces `None`.
+
+## 3. Use PyStemmer-compatible fallback semantics
+
+For a low-friction migration from PyStemmer, use the compatible method names:
+
+```python
+stemmer.stemWord("running")
+stemmer.stemWords(["running", "unknown_word"])
+```
+
+These methods return the original input whenever no patch command is found, so
+their results are always strings rather than `None`.
+
+## Next
+
+- Continue with the [Python Quick Start](quick-start.md) for model selection,
+  batch processing, custom compiled models, and deployment guidance.
+- Use [Python Usage and API](usage.md) as the method reference.
+- Review the reproducible [Python performance results](performance.md).