fix: Remove unused variables flagged by ruff

- Remove unused loop variable 'j' in bulk_utils.py
- Remove unused return value 'edges_by_episode' in test
- Replace unused 'edge_uuid' with '_' in test loop

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

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

graphiti_core/utils/bulk_utils.py

@@ -433,7 +433,7 @@ async def dedupe_edges_bulk(
     dedupe_tuples: list[tuple[EpisodicNode, EntityEdge, list[EntityEdge]]] = []
     for i, edges_i in enumerate(extracted_edges):
         existing_edges: list[EntityEdge] = []
-        for j, edges_j in enumerate(extracted_edges):
+        for edges_j in extracted_edges:
             existing_edges += edges_j
 
         for edge in edges_i:

tests/utils/maintenance/test_bulk_utils.py

@@ -313,7 +313,7 @@ async def test_dedupe_edges_bulk_deduplicates_within_episode(monkeypatch):
         episodes=[episode.uuid],
     )
 
-    edges_by_episode = await bulk_utils.dedupe_edges_bulk(
+    await bulk_utils.dedupe_edges_bulk(
         clients,
         [[edge1, edge2, edge3]],
         [(episode, [])],
@@ -325,6 +325,6 @@ async def test_dedupe_edges_bulk_deduplicates_within_episode(monkeypatch):
     # Verify that edges were compared against each other (within same episode)
     # Each edge should have been compared against all 3 edges (including itself, which gets filtered)
     assert len(comparisons_made) == 3
-    for edge_uuid, compared_against in comparisons_made:
+    for _, compared_against in comparisons_made:
         # Each edge should have access to all 3 edges as candidates
         assert len(compared_against) >= 2  # At least 2 others (self is filtered out)