refactor(nox): drop unused default for TORCH_GROUP

The Makefile always exports TORCH_GROUP before invoking nox, so the
Python-side default was dead code for every make test-smoke run;
kept only for a bare, non-Make nox invocation which isn't a supported
entrypoint.

Author: guru-desh

ci/nox/noxfile.py

@@ -34,11 +34,7 @@
 options.default_venv_backend = "uv"
 options.error_on_missing_interpreters = True
 
-# Pins the torch minor version smoke tests install, one of the torch_2_*
-# dependency groups in pyproject.toml — TORCH_GROUP is the project-wide
-# source of truth (see Makefile), exported by `make test-smoke` and set per
-# job by the CI matrix (ci.yaml); defaults to the newest supported.
-TORCH_GROUP = os.environ.get("TORCH_GROUP", "torch_2_11")
+TORCH_GROUP = os.environ.get("TORCH_GROUP")
 
 
 @session(