Pin mem0ai[nlp]==2.0.2 and fastembed for the new hybrid-search pipeline.
Drop OSS graph memory (removed upstream in 2.0.0, PR #4805): remove Neo4j
service, env vars, volumes, and driver deps; mark /graph/relationships
deprecated. Rewrite Memory.search/get_all/chat/health call sites to use
the v2 filters={} + top_k API (entity IDs at top level now raise
ValueError). Tighten MCP remove_memory ownership check to O(1)
verify_memory_ownership so it doesn't silently truncate at the new
top_k=20 default. Downgrade base image to python:3.12-slim for spaCy.
Adds scripts/migrate_qdrant_to_v3.py (scroll+upsert with per-user count
parity check) and docs/MIGRATION_RUNBOOK.md covering snapshot, dump,
collection rebuild, cutover, and rollback procedures.
