Remove non-existent Vertex AI embedding models from VERTEX_MODEL_DIMENSIONS

[Copilot]

The VERTEX_MODEL_DIMENSIONS dictionary and associated tests referenced two Vertex AI embedding models that don't exist in Google's actual API: text-embedding-005 and text-multilingual-embedding-002. This could mislead developers into attempting to use these models.

Changes

• Removed non-existent models from VERTEX_MODEL_DIMENSIONS:

  • text-embedding-005 (does not exist)
  • text-multilingual-embedding-002 (does not exist)

• Updated unit tests to only validate real Vertex AI models:

  • test_dimensions_property
  • test_all_known_models_have_dimensions

• Fixed documentation in product-improvements.adoc to reflect actual available models

Remaining Models

All five models now listed are confirmed to exist in Vertex AI:

VERTEX_MODEL_DIMENSIONS = {
    "text-embedding-004": 768,
    "textembedding-gecko@003": 768,
    "textembedding-gecko@002": 768,
    "textembedding-gecko@001": 768,
    "textembedding-gecko-multilingual@001": 768,
}

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

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