Implement executing tasks

core/tasks/providers/__init__.py

@@ -0,0 +1,19 @@
+from __future__ import annotations
+
+from .base import TaskProvider
+from .codex_cli import CodexCLITaskProvider
+from .mock import MockTaskProvider
+
+PROVIDERS = {
+    "mock": MockTaskProvider(),
+    "codex_cli": CodexCLITaskProvider(),
+}
+
+
+def get_provider(name: str) -> TaskProvider:
+    key = str(name or "").strip().lower()
+    return PROVIDERS.get(key, PROVIDERS["mock"])
+
+
+def list_providers() -> list[TaskProvider]:
+    return list(PROVIDERS.values())