MnemosyneEcto.Adapter.Postgres (mnemosyne_ecto v0.2.0)

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PostgreSQL + pgvector implementation of MnemosyneEcto.Adapter.

Stores embeddings in a vector(N) column, performs KNN via pgvector's cosine_distance/2, creates per-node-type partial HNSW/IVFFlat indexes, and tracks the migrated schema version in the nodes table comment.