Add a multi-language mutation tester that writes .metrics/mutate for uml-viewer.

pyproject.toml

@@ -0,0 +1,26 @@
+[project]
+name = "mutator"
+version = "0.1.0"
+description = "Mutation testing for Clojure, Java, Go, TypeScript, Rust, and Python, in the snapshot uml-viewer reads."
+readme = "README.md"
+requires-python = ">=3.11"
+dependencies = [
+    "tree-sitter>=0.24",
+    "tree-sitter-language-pack>=0.7",
+]
+
+[project.scripts]
+mutator = "mutator.cli:main"
+
+[project.optional-dependencies]
+dev = ["pytest>=8"]
+
+[build-system]
+requires = ["setuptools>=68"]
+build-backend = "setuptools.build_meta"
+
+[tool.setuptools.packages.find]
+where = ["src"]
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]