feat(config): add multi2vec-twelvelabs vectorizer support (#2113)

[Anai-Guo]

Closes #2113.

Adds client-side support for the multi2vec-twelvelabs vectorizer shipping with Weaviate v1.37+.

What's here

• Vectorizers.MULTI2VEC_TWELVELABS enum member (+ docstring entry)
• _Multi2VecTwelvelabsConfig in config_vectorizers.py — baseURL / model on top of _Multi2VecBase, with the usual AnyHttpUrl → string coercion in _to_dict()
• Configure.Vectors.multi2vec_twelvelabs(...) in config_vectors.py
• A test_config.py case asserting the serialized payload

The settings surface matches the issue (model, default marengo3.0; baseURL) and the server module's class_settings.go, which registers exactly textFields and imageFields as its multimodal fields — so no video/audio field parameters are exposed here.

Serialized payload for multi2vec_twelvelabs(name="t", model="marengo3.0", base_url="https://api.twelvelabs.io/v1.3", image_fields=[Multi2VecField(name="img", weight=0.7)], text_fields=["txt"]):

{
  "vectorizer": {
    "multi2vec-twelvelabs": {
      "imageFields": ["img"],
      "textFields": ["txt"],
      "baseURL": "https://api.twelvelabs.io/v1.3",
      "model": "marengo3.0",
      "weights": {"imageFields": [0.7]}
    }
  },
  "vectorIndexType": "hnsw"
}

Scope notes

Following the precedent of #1977 (multi2vec_google_gemini), this only adds the module to the current Configure.Vectors surface — not to the deprecated Configure.Vectorizer / Configure.NamedVectors surfaces. Happy to add those, an docs/changelog.rst entry, or an integration/test_vectors.py case if you'd like them in this PR.

Verification

Ran the unit suite locally against this branch (Python 3.12, Windows):

• test/collection/test_config.py: 191 passed on main → 192 passed with this change (the new case).
• Full test/: 373 passed / 13 failed on main → 374 passed / 13 failed with this change — the same 13 pre-existing failures (test_util.py b64 image/file fixtures, test_timeout.py, and two input-validation cases), all unrelated to this change and unaffected by it.
• With the source left unpatched, the new test case fails as expected: AttributeError: type object '_Vectors' has no attribute 'multi2vec_twelvelabs'.
• ruff==0.14.7 (repo ruff.toml): format --check reports 3 files already formatted; check passes.
• flake8==7.3.0 with the pre-commit plugin set (bugbear / comprehensions / builtins / docstrings / pydoclint): clean on both changed source files.

🤖 Generated with Claude Code

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[Anai-Guo]

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