test: drop stale mock of nonexistent ollama.embed_text

The tenant-scoping fixture still stubbed embed_text, which does not
exist on OllamaClient - the exact mock-a-nonexistent-method pattern
that hid the original HybridRAG document-leg bug (406143e). A
regression reintroducing embed_text would have passed this suite.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QbFZyDvYksazX6nYQYZ67L

tests/test_tenant_scoping.py

@@ -55,7 +55,9 @@ def mock_ollama():
     ollama.embed_batch = AsyncMock(
         side_effect=lambda texts, **kw: [[0.1] * 768 for _ in texts]
     )
-    ollama.embed_text = AsyncMock(return_value=[0.1] * 768)
+    # NOTE: do not stub methods that don't exist on OllamaClient (a stale
+    # embed_text stub here previously hid a latent AttributeError in the
+    # HybridRAG document leg - see 406143e).
     ollama.generate_text = AsyncMock(return_value="{}")
     return ollama