feat(scenegraph): refactor image scene graph query into reusable function

- Export ImageSceneGraphQueryResult and query_image_against_scene_graph from scenegraph module
- Replace inline hamming-distance-based image matching with dedicated query_image_against_scene_graph function
- Improve top_matches structure by extracting similarity scores and hash_bytes from matches
- Add .codegraph/ to gitignore (machine-local data, should not be committed)
- Add CodeGraph configuration for multi-language indexing

mini-nav/scenegraph/__init__.py

@@ -13,12 +13,14 @@ from .hash_codec import (
     hash_bytes_to_cam_row,
 )
 from .objectnode import ObjectNode
+from .query import ImageSceneGraphQueryResult, query_image_against_scene_graph
 from .roomnode import RoomNode
 from .scenegraph import SceneGraphMatch, SimpleSceneGraph
 from .software_cam import CamMatch, SoftwareCamIndex, xnor_popcount_score
 
 __all__ = [
     "CamMatch",
+    "ImageSceneGraphQueryResult",
     "ObjectNode",
     "RoomNode",
     "SceneGraphMatch",
@@ -29,5 +31,6 @@ __all__ = [
     "cam_row_to_hash_bytes",
     "hash_bytes_to_bits_array",
     "hash_bytes_to_cam_row",
+    "query_image_against_scene_graph",
     "xnor_popcount_score",
 ]