Remove the nonexistent openenv[core] extra from the sophistry example and CLI test fixtures (#1020)

The published extras are daytona, aca, modal and inspect. There is no `core`,
so `openenv[core]` made uv and pip warn before installing the base package
anyway, and every HF Jobs log carried the warning.

The backfill test's `openenv[core]` assertion is untouched on purpose: it
exercises name rewriting over historical `openenv-core` releases, which did
declare that extra.

Author: sergiopaniego

examples/sophistry_bench_sprint_grpo.py

@@ -3,7 +3,10 @@
 # /// script
 # requires-python = ">=3.10"
 # dependencies = [
-#     "openenv[core]",
+#     # Plain `openenv`: there is no `core` extra. The published extras are
+#     # daytona, aca, modal and inspect, and uv only warns before installing
+#     # the base package anyway, so the old spelling polluted every job log.
+#     "openenv",
 #     "trl",
 #     "datasets",
 #     "torch",
@@ -15,7 +18,7 @@
 
 Single-step env, so this is a plain prompt -> completion -> reward GRPO setup:
 no `environment_factory`/tool-calling needed. Uses `GenericEnvClient` so the
-script only depends on `openenv[core]` from PyPI, which also makes it runnable
+script only depends on `openenv` from PyPI, which also makes it runnable
 as a standalone `uv` script, including via Hugging Face Jobs:
 
     hf jobs uv run examples/sophistry_bench_sprint_grpo.py --flavor a10g-small \
@@ -26,7 +29,7 @@
 (`SUPPORTS_CONCURRENT_SESSIONS = False`), and `from_env()` + `.sync()` can
 leave behind an orphaned first connection that occupies that single slot (see
 https://github.com/huggingface/OpenEnv/pull/854). Needs the `project_path`
-git-clone fix from that PR; until it's released, override the `openenv[core]`
+git-clone fix from that PR; until it's released, override the `openenv`
 dependency above with a git ref of it.
 
 Run locally:

tests/test_cli/test_push.py

@@ -40,7 +40,7 @@ def _create_test_openenv_env(env_dir: Path, env_name: str = "test_env") -> None:
     pyproject_content = f"""[project]
 name = "{env_name}"
 version = "0.1.0"
-dependencies = ["openenv[core]>=0.2.0"]
+dependencies = ["openenv>=0.2.0"]
 """
     (env_dir / "pyproject.toml").write_text(pyproject_content)
 

tests/test_cli/test_validate.py

@@ -251,7 +251,7 @@ def test_validate_command_accepts_dockerfile_managed_openenv_runtime(
         'server = "server.app:main"\n'
     )
     (env_dir / "server" / "Dockerfile").write_text(
-        'RUN pip install --no-cache-dir --no-deps "openenv[core]>=0.2.2"\n'
+        'RUN pip install --no-cache-dir --no-deps "openenv>=0.2.2"\n'
     )
 
     result = runner.invoke(app, ["validate", str(env_dir), "--json"])