feat: scaffold markovian-rsa-mlx package + CLI

Public release v0.1.0 in progress. MIT, Python 3.12+, depends on
kyr0/mlx-lm fork (feat/zaya-support) for ZAYA model support until
upstream PR #1261 merges.

tests/test_smoke.py

@@ -0,0 +1,8 @@
+def test_package_imports():
+    import markovian_rsa_mlx
+    assert hasattr(markovian_rsa_mlx, "__version__")
+
+
+def test_cli_module_importable():
+    from markovian_rsa_mlx import cli
+    assert hasattr(cli, "app")