The bot commit e7a7d39 introduced a duplicate merge_configs() function and a
_deep_merge_two() helper inside runtime.py under a '# Config merging' section.
It also renamed the canonical import in __init__.py to _legacy_merge_configs and
re-exported merge_configs from runtime instead.
This commit undoes those changes:
- Removes merge_configs() and _deep_merge_two() from runtime.py entirely.
- Restores 'from cleveractors.config_utils import merge_configs' (no alias) in __init__.py.
- Removes merge_configs from the 'from cleveractors.runtime import (...)' block.
- merge_configs remains in __all__ — now correctly backed by config_utils.
- Also fixes a pre-existing ruff B007 lint violation in runtime.py
(_build_factory_config loop variable agent_name → _agent_name).
The canonical implementation in config_utils.py is unchanged.
ISSUES CLOSED: #11
hurui200320