fix(tests): make the import-compat proof order-independent

beacon-reviewer caught a real gap: tests/test_comfyui_import_compat.py
ERRORed (not passed) when run in isolation or under a file-sharded
runner — the autouse _clear_ollama_caches fixture from conftest.py
does `from comfydv._llm.ollama_provider import ...`, and this file
was the one case where nothing had already bound `comfydv` in
sys.modules correctly first, so it resolved to the wrong package.
Only the full single-process suite happened to be green.

Fixed by shadowing that fixture with a local no-op override scoped
to this module: these tests exercise package import resolution
itself, not OllamaProvider/ChatCompletion state, so there is nothing
for the original fixture to reset here — and depending on it made
the test order-dependent on an unrelated file's import order, which
is exactly the kind of fragility this file exists to guard against.
Verified: passes standalone (`pytest tests/test_comfyui_import_compat.py`)
and as part of the full suite.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0132ojafeazQ3ephcBejEWFj

tests/test_comfyui_import_compat.py

@@ -24,8 +24,25 @@ import sys
 import textwrap
 from pathlib import Path
 
+import pytest
+
 REPO_ROOT = Path(__file__).parent.parent
 
+
+@pytest.fixture(autouse=True)
+def _clear_ollama_caches():
+    """Shadow conftest.py's autouse fixture of the same name for this module
+    only. That fixture's own setup does `from comfydv._llm.ollama_provider
+    import ...` — this file's tests are the exact reproduction of an
+    environment where `comfydv` resolving correctly can't be assumed (that's
+    the point of the file), so depending on it for an unrelated cache-reset
+    would make these tests order-dependent on whichever other test file
+    happens to import `comfydv` "the normal way" first in the session. These
+    tests touch no OllamaProvider/ChatCompletion state, so there is nothing
+    to reset."""
+    yield
+
+
 _SUBPROCESS_SCRIPT = textwrap.dedent(
     """
     import sys