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

python/tests/test_distribution_verifier.py

@@ -0,0 +1,93 @@
+###############################################################################
+# Copyright (C) 2026, Leo Galambos
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+# 1. Redistributions of source code must retain the above copyright notice,
+#    this list of conditions and the following disclaimer.
+#
+# 2. Redistributions in binary form must reproduce the above copyright notice,
+#    this list of conditions and the following disclaimer in the documentation
+#    and/or other materials provided with the distribution.
+#
+# 3. Neither the name of the copyright holder nor the names of its contributors
+#    may be used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+###############################################################################
+
+"""Regression tests for Python release-archive metadata validation."""
+
+from __future__ import annotations
+
+import sys
+from email.message import Message
+from pathlib import Path
+
+import pytest
+
+SCRIPTS = Path(__file__).resolve().parents[1] / "scripts"
+sys.path.insert(0, str(SCRIPTS))
+
+from build_standard_distribution import (  # noqa: E402
+    _ignore_build_artifacts,
+    _validate_generated_project,
+)
+from verify_distributions import _assert_main_dependency  # noqa: E402
+
+
+def test_standard_model_source_tree_contains_no_generated_payload() -> None:
+    source = Path(__file__).resolve().parents[1] / "models-standard"
+    package = source / "radixor_models_standard"
+
+    assert not (package / "manifest.json").exists()
+    assert not list((package / "models").glob("*.rxc"))
+    assert not list((package / "notices").glob("*/NOTICE-model-data.txt"))
+
+
+def test_standard_model_build_rejects_source_skeleton() -> None:
+    source = Path(__file__).resolve().parents[1] / "models-standard"
+
+    with pytest.raises(ValueError, match="manifest is missing"):
+        _validate_generated_project(source)
+
+
+def test_standard_model_build_ignores_local_build_state() -> None:
+    names = [
+        "build",
+        "dist",
+        "radixor_models_standard.egg-info",
+        "__pycache__",
+        "module.pyc",
+        "module.pyo",
+        "manifest.json",
+    ]
+
+    assert _ignore_build_artifacts("unused", names) == set(names[:-1])
+
+
+def test_native_distribution_requires_compatible_standard_models() -> None:
+    metadata = Message()
+    metadata["Requires-Dist"] = "radixor-models-standard >=1.0, <2.0"
+
+    _assert_main_dependency(metadata, "radixor-4.1.0.tar.gz")
+
+
+def test_native_distribution_rejects_missing_standard_models() -> None:
+    metadata = Message()
+
+    with pytest.raises(ValueError, match="standard-model dependency"):
+        _assert_main_dependency(metadata, "radixor-4.1.0.tar.gz")