Gate finding BN21 r1 quality (Lows):
- The race/eager-import snippets put the repo on sys.path three ways; PYTHONPATH and
cwd already do it, so drop the in-snippet sys.path.insert and the REPO_ROOT templating.
- The deadlock explanation was spelled out in the module docstring, again in the
__getattr__ docstring, and a third time in the test module. Cut it to a 2-line
pointer to the test, and give __getattr__ a one-line docstring that describes what
it does (cache the name in globals()).
- Unquote the dict[str, str] / list[str] annotations: requires-python is >=3.11.
No behaviour change. Both kept tests still pass on HEAD and fail with BASE
tools/connectors/__init__.py.
ddc0e65958