feat(google-vertex/zai-org/glm-5.2-maas): add new models [bot]

[models-bot]

Auto-generated by model-addition-agent for google-vertex/zai-org/glm-5.2-maas.

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Note

Low Risk
Adds static model metadata only; no runtime or security-sensitive code changes.

Overview
Adds a new provider definition for zai-org/glm-5.2-maas on Google Vertex (serverless MAAS), auto-generated by the model-addition agent.

The entry marks the model as preview with thinking enabled, chat mode, text-in/text-out, and features including function calling, tool choice, structured output, and system messages. Limits are set to a 1M context window and 64k max output/max_tokens, with max_tokens defaulting to 256. Pricing is listed under global only, with a note that official Vertex pricing is not yet published for this preview model.

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