feat: add build system, mypy and editable source

pyproject.toml

@@ -1,3 +1,7 @@
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
 [project]
 name = "2026sel3-project"
 version = "0.1.0"
@@ -41,3 +45,36 @@ dev = [
     "pytest>=8.0.0",
     "ruff>=0.15.2",
 ]
+
+[tool.hatch.build.targets.wheel]
+packages = ["src/brittle_star_project", "src/experiment_logger"]
+
+[tool.mypy]
+mypy_path = "src"
+check_untyped_defs = false
+warn_return_any = false
+
+[[tool.mypy.overrides]]
+module = [
+    "jax.*",
+    "flax.*",
+    "wandb.*",
+    "torch.*",
+    "mujoco.*",
+    "mujoco_warp.*",
+    "optax.*",
+    "tyro.*",
+    "biorobot.*",
+    "gymnasium.*",
+    "matplotlib.*",
+    "mediapy.*",
+    "matplotlib.*",
+    "mediapy.*",
+    "pytest.*",
+    "tensorboard.*",
+    "tqdm.*",
+    "numpy.*",
+    "yaml.*",
+    "moojoco.*"
+]
+ignore_missing_imports = true