feat(memory): embedding-based entity resolution for graph memory #1230
Description
Summary
Follow-up to graph memory epic (#1222). MVP uses exact name+type match for entity resolution. This issue adds embedding-based resolution for higher quality deduplication.
When use_embedding_resolution = true:
- Embed entity name+summary → search existing entities via Qdrant
- cosine > 0.85: merge entities
- 0.70-0.85: LLM disambiguation
- < 0.70: create new entity
Batch embedding to respect timeout budget.
Depends on: #1225 (extraction pipeline)