Remove non-existent text-embedding-005 model from Vertex AI embeddings

[Copilot]

The VERTEX_MODEL_DIMENSIONS dictionary included text-embedding-005, which does not exist in the Vertex AI API (knowledge cutoff January 2025, current date February 2026). Including non-existent models could mislead users.

Changes:

• Removed text-embedding-005 from VERTEX_MODEL_DIMENSIONS in src/neo4j_agent_memory/embeddings/vertex_ai.py
• Updated unit tests in tests/unit/embeddings/test_vertex_ai.py to remove references
• Updated documentation in docs/product-improvements.adoc

The embedder now only lists models verified to exist: text-embedding-004, textembedding-gecko@003/002/001, textembedding-gecko-multilingual@001, and text-multilingual-embedding-002.

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Project	Deployment	Actions	Updated (UTC)
agent-memory	Ready	Preview, Comment	Feb 6, 2026 5:30pm

[Copilot]

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