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.

.gitignore

@@ -0,0 +1,14 @@
+__pycache__/
+*.py[cod]
+*$py.class
+.venv/
+.pytest_cache/
+.ruff_cache/
+dist/
+build/
+*.egg-info/
+.DS_Store
+.vscode/
+.idea/
+audit-*.jsonl
+bench-out/