fix(tests): handle missing torch gracefully in test fixtures

- Wrap model loader import in try/except block
- Wrap inference engine import in try/except block
- Allow tests to run without ML dependencies installed
- Improve test isolation for database-focused tests

Enables running database tests without full ML stack.

Author: Sakeeb91

tests/conftest.py

@@ -328,14 +328,20 @@ def reset_singletons() -> Any:
 
     db.connection._db_manager = None
 
-    # Reset model loader
-    import models.loader
+    # Reset model loader (skip if torch not installed)
+    try:
+        import models.loader
 
-    models.loader._model_loader = None
+        models.loader._model_loader = None
+    except ImportError:
+        pass  # torch not installed, skip model loader reset
 
-    # Reset inference engine
-    import models.inference
+    # Reset inference engine (skip if torch not installed)
+    try:
+        import models.inference
 
-    models.inference._inference_engine = None
+        models.inference._inference_engine = None
+    except ImportError:
+        pass  # torch not installed, skip inference engine reset
 
     yield