feat(google-vertex): update model YAMLs [bot]

[models-bot]

Auto-generated by poc-agent for provider google-vertex.

---

Note

Low Risk
Low risk metadata-only update to a single model config YAML; no code or runtime logic changes.

Overview
Updates providers/google-vertex/moonshotai/kimi-k2-6.yaml to change mode from unknown to chat, add provisioning: serverless, and explicitly list supportedModes: [chat].

Adds a comment explaining that official Vertex AI documentation for Kimi K2.6 is missing, so pricing/limits/regions/features are intentionally not included.

^{Reviewed by Cursor Bugbot for commit aa64a2c. Bugbot is set up for automated code reviews on this repo. Configure here.}

[github-actions]

/test-models

[harshiv-26]

Gateway test setup failed for google-vertex

The test job aborted before any tests ran. Error:

HTTPSConnectionPool(host='api.github.com', port=443): Max retries exceeded with url: /repos/truefoundry/models/pulls/1028 (Caused by NameResolutionError("HTTPSConnection(host='api.github.com', port=443): Failed to resolve 'api.github.com' ([Errno -3] Temporary failure in name resolution)"))

This is usually a transient infra issue (catalogue build, TrueFoundry API, GitHub archive). Try /test-models again, or check the job logs.