fix(types): correct import path and add type annotations

- Fix MultiModalEmbeddings import path (atoms subdirectory)
- Add explicit type annotation for device attribute
- Add type ignore comment for optional import assignment

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: MementoRC

src/uckn/core/atoms/multi_modal_embeddings.py

@@ -81,14 +81,13 @@ class MultiModalEmbeddings:
     def __init__(self, device: str | None = None):
         self._logger = logging.getLogger(__name__)
         # Defensive: If torch is unavailable, always use cpu
+        self.device: str = "cpu"  # Default value
         if (
             torch is not None
             and hasattr(torch, "cuda")
             and callable(getattr(torch.cuda, "is_available", None))
         ):
             self.device = device or ("cuda" if torch.cuda.is_available() else "cpu")
-        else:
-            self.device = "cpu"
         self._lock = threading.Lock()
 
         # Model loading

src/uckn/core/semantic_search_enhanced.py

@@ -47,15 +47,15 @@
     CHROMADB_CONNECTOR_AVAILABLE = False
 
 try:
-    from .multi_modal_embeddings import MultiModalEmbeddings
+    from .atoms.multi_modal_embeddings import MultiModalEmbeddings
 
     MULTIMODAL_EMBEDDINGS_AVAILABLE = True
 except ImportError:
     logging.getLogger(__name__).warning(
         "MultiModalEmbeddings not found. "
         "Multi-modal search capabilities will be limited."
     )
-    MultiModalEmbeddings = None
+    MultiModalEmbeddings = None  # type: ignore[misc, assignment]
     MULTIMODAL_EMBEDDINGS_AVAILABLE = False