"""Minimal service registry. Apps call `register_service(name, instance)` at startup."""
from typing import Any

_services: dict[str, Any] = {}


def register_service(name: str, instance: Any) -> None:
    _services[name] = instance


def get_service(name: str) -> Any:
    if name not in _services:
        raise KeyError(f"Service not registered: {name}")
    return _services[name]


def has_service(name: str) -> bool:
    return name in _services