Precompiled 2026-08-29-1733af0

ai-sdk-provider: add embeddings, Messages, and Responses (#56829)

Adds endpoint-specific model interfaces to `@convex-dev/ai-sdk-provider`:

```ts
convexGateway.embeddingModel("openai/text-embedding-3-small");
convexGateway.messages("anthropic/claude-sonnet-4.5");
convexGateway.responses("openai/gpt-5");
```

> [!CAUTION]
> Merge this PR at `0.2.0-alpha.0`, then publish the alpha from `main` for internal validation. Once validated, open a separate release PR that bumps the version to `0.2.0`; merge that before publishing the stable release.

GitOrigin-RevId: c296f34029610ce903a5ecc2116aceea0915669e