feat: add reactor control persistence and tests

pyproject.toml

@@ -0,0 +1,16 @@
+[project]
+name = "fission-sim"
+version = "0.1.0"
+description = "Simplified nuclear reactor simulation"
+requires-python = ">=3.10"
+authors = [
+    { name = "Fission Sim Team" }
+]
+dependencies = []
+
+[project.optional-dependencies]
+dev = ["pytest>=7.0"]
+
+[build-system]
+requires = ["setuptools>=61"]
+build-backend = "setuptools.build_meta"