Agent/gateway/core/channels/backends/__init__.py

from gateway.core.channels.backends.echo_executor import EchoExecutorBackend
from gateway.core.channels.backends.memory_trace import MemoryTraceBackend
from gateway.core.channels.backends.user_id import DefaultUserIdentityResolver

__all__ = [
    "DefaultUserIdentityResolver",
    "EchoExecutorBackend",
    "MemoryTraceBackend",
]