fix: gate real uv-compile tests behind TEST_TORCH_BACKEND, improve README precedence docs

Author: bigcat88

README.md

@@ -70,14 +70,17 @@ will simply update the comfy.yaml file to reflect the local setup
 
 #### Python environment handling
 
-When you run `comfy install`, comfy-cli decides where to install ComfyUI
-dependencies based on how comfy-cli itself was installed:
-
-- **`pip install comfy-cli`** (global / system Python): dependencies are installed directly into 
-  the same Python environment. This is the typical setup inside Docker containers.
-- **`pipx install comfy-cli`** or **`uv tool install comfy-cli`** (isolated tool environment): a `.venv` is created 
-  inside the ComfyUI workspace and dependencies go there. Use `comfy launch` to start ComfyUI with the correct Python.
-- If a **virtualenv** or **conda** environment is already active (`VIRTUAL_ENV` / `CONDA_PREFIX`), that environment is used as-is.
+When you run `comfy install`, comfy-cli picks a Python environment for ComfyUI
+dependencies using the following precedence:
+
+1. An **active virtualenv or conda** environment (`VIRTUAL_ENV` / `CONDA_PREFIX`) is used as-is.
+2. An **existing `.venv` or `venv`** directory inside the workspace is reused.
+3. Otherwise the choice depends on how comfy-cli was installed:
+   - **`pip install comfy-cli`** (global / system Python): dependencies go
+     directly into the same Python environment. This is the typical Docker setup.
+   - **`pipx install comfy-cli`** or **`uv tool install comfy-cli`** (isolated
+     tool environment): a `.venv` is created inside the ComfyUI workspace.
+     Use `comfy launch` to start ComfyUI with the correct Python.
 
 ### Specifying execution path
 

tests/comfy_cli/test_global_python_install.py

@@ -117,10 +117,15 @@ def test_non_fast_deps_uses_global_python(self, tmp_path):
         MockCompiler.assert_not_called()
 
 
+@pytest.mark.skipif(
+    os.environ.get("TEST_TORCH_BACKEND") != "true",
+    reason="Set TEST_TORCH_BACKEND=true to run integration tests that call uv pip compile",
+)
 class TestDependencyCompilerGlobalPython:
-    """Run the real DependencyCompiler compile step (no mocks) using the
-    current Python as if it were a global install.  Verifies the compiled
-    output contains expected packages and correct index URLs."""
+    """Integration tests: run the real DependencyCompiler compile step (no
+    mocks, requires network) using the current Python as if it were a global
+    install.  Verifies the compiled output contains expected packages and
+    correct index URLs."""
 
     @pytest.fixture()
     def workspace(self, tmp_path):