test: additional testing and visual confirmations

tests/test_configs.py

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+import pytest
+from hydra import compose, initialize
+from omegaconf import OmegaConf
+from brittle_star_project.configs.main_config import BrittleStarConfig
+from brittle_star_project.configs.register_configs import register_configs
+
+# Registration must happen before composition to enable validation against schemas
+register_configs()
+
+
+def test_config_composition_centralized():
+    """Test that the centralized configuration composes and validates correctly."""
+    with initialize(version_base="1.3", config_path="../configs"):
+        # We compose the config; it follows main_config.yaml
+        cfg = compose(config_name="main_config", overrides=["architecture=centralized"])
+
+        # Merge with the dataclass class to get a structured DictConfig,
+        # then convert to a real dataclass instance to verify validation.
+        structured_cfg = OmegaConf.to_object(OmegaConf.merge(BrittleStarConfig, cfg))
+
+        # Basic assertions
+        assert "CentralizedConfig" in str(type(structured_cfg.architecture))
+        assert isinstance(structured_cfg.ppo.learning_rate, float)
+        assert structured_cfg.ppo.learning_rate > 0
+
+
+def test_config_composition_decentralized():
+    """Test that the decentralized configuration composes and validates correctly."""
+    with initialize(version_base="1.3", config_path="../configs"):
+        cfg = compose(config_name="main_config", overrides=["architecture=decentralized"])
+
+        # Merge and convert to dataclass instance
+        structured_cfg = OmegaConf.to_object(OmegaConf.merge(BrittleStarConfig, cfg))
+
+        # Basic assertions
+        assert "DecentralizedConfig" in str(type(structured_cfg.architecture))
+        assert isinstance(structured_cfg.ppo.learning_rate, float)
+        assert structured_cfg.ppo.learning_rate > 0
+
+        # Decentralized specifics
+        assert hasattr(structured_cfg.architecture, "message_passing_steps")
+        assert structured_cfg.architecture.message_passing_steps > 0