[rodrigobarona]

Summary

Fixes #168.

• Adds an optional Vercel AI Gateway provider to Dato Agent, alongside OpenAI and Anthropic.
• Reuses the client-side MCP Messages runtime against https://ai-gateway.vercel.sh, with a short recommended model list and the rest of the tool-capable catalog behind a toggle.
• Strips browser SDK headers the gateway CORS policy rejects, inlines attachments (the gateway has no Anthropic Files API), and keeps gateway API keys out of runtime error text.

Non-Claude models run through the gateway's Messages translation. Zero data retention depends on the model's zdr flag. The recommended IDs were checked against the public catalog; they have not been smoke-tested with a live gateway key.

Test plan

• npm run typecheck in dato-agent
• npm test for config, provider models, gateway fetch, change summaries, ConfigScreen, and both agent runtimes
• In plugin settings, choose Vercel AI Gateway, paste a vck_ key, and confirm the recommended models load
• Run a read-only turn on Claude Sonnet 5.5 and one non-Claude recommended model
• Approve one write and confirm the existing approval journal still applies
• Confirm an existing OpenAI or Anthropic configuration is unchanged

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