refactor: add static source provider seam

src/wf_sources_python/__init__.py

@@ -1,9 +1,15 @@
 from __future__ import annotations
 
-from .loader import PythonSourceConfigLike, load_python_source, python_capability_source
+from .loader import (
+    PythonSourceConfigLike,
+    PythonSourceProvider,
+    load_python_source,
+    python_capability_source,
+)
 
 __all__ = [
     "PythonSourceConfigLike",
+    "PythonSourceProvider",
     "load_python_source",
     "python_capability_source",
 ]

src/wf_sources_python/loader.py

@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import sys
 from collections.abc import Mapping, Sequence
+from dataclasses import dataclass
 from importlib import import_module
 from pathlib import Path
 from typing import Any, Protocol
@@ -23,6 +24,16 @@ class PythonSourceConfigLike(Protocol):
     enabled: bool
 
 
+@dataclass(frozen=True, slots=True)
+class PythonSourceProvider:
+    """Static source provider for trusted Python source config entries."""
+
+    configs: Sequence[PythonSourceConfigLike]
+
+    def load_sources(self) -> Mapping[str, CapabilitySource]:
+        return {config.id: python_capability_source(config) for config in self.configs}
+
+
 def load_python_source(
     *,
     source_id: str,