refactor: Separate runtime from build. Enhance configuration and registry management, migrate to registry-based component handling

castle-api/src/castle_api/config.py

@@ -4,11 +4,13 @@ from pathlib import Path
 
 from pydantic_settings import BaseSettings
 
+from castle_core.config import CastleConfig, load_config
+from castle_core.registry import NodeRegistry, load_registry
+
 
 class Settings(BaseSettings):
     """Service settings loaded from environment variables."""
 
-    castle_root: Path = Path("/data/repos/castle")
     host: str = "0.0.0.0"
     port: int = 9020
 
@@ -19,3 +21,32 @@ class Settings(BaseSettings):
 
 
 settings = Settings()
+
+
+def get_registry() -> NodeRegistry:
+    """Load the node registry. Raises if not found."""
+    return load_registry()
+
+
+def get_castle_root() -> Path | None:
+    """Get the castle repo root from the registry, if available."""
+    try:
+        registry = load_registry()
+        if registry.node.castle_root:
+            return Path(registry.node.castle_root)
+    except (FileNotFoundError, ValueError):
+        pass
+    return None
+
+
+def get_config() -> CastleConfig:
+    """Load castle.yaml via the registry's castle_root.
+
+    Raises FileNotFoundError if repo not available.
+    """
+    root = get_castle_root()
+    if root is None:
+        raise FileNotFoundError(
+            "Castle repo not available. Set castle_root in registry."
+        )
+    return load_config(root)