Bug: Continuous 429 RESOURCE_EXHAUSTED on gemini-3.1-flash-image for Google AI Pro Plan

### Summary

I am on a **Google AI Pro** plan in Antigravity. However, whenever an image generation request is made (`generate_image` calling `gemini-3.1-flash-image` via `cloudcode-pa.googleapis.com`), it consistently fails with `429 RESOURCE_EXHAUSTED`. This issue has persisted across multiple days.

### Account Details

- **Plan**: Google AI Pro

- Account: ed*******@gmail.com

- **Environment**: Antigravity IDE on macOS

### Error Details

```json

{

“error”: {

"code": 429,

"message": "You have exhausted your capacity on this model. Your quota will reset after 3s.",

"status": "RESOURCE_EXHAUSTED",

"details": \[

  {

    "@type": "type.googleapis.com/google.rpc.ErrorInfo",

    "reason": "RATE_LIMIT_EXCEEDED",

    "domain": "cloudcode-pa.googleapis.com",

    "metadata": {

      "model": "gemini-3.1-flash-image",

      "quotaResetDelay": "3.15s",

      "uiMessage": "true"

    }

  }

\]

}

}

```

### Steps Taken to Troubleshoot

1. Waited several minutes and across several days to rule out short-term burst rate limits.

2. Signed out of the Antigravity IDE, restarted the IDE, and signed back in.

3. Verified the account is recognized as `Google AI Pro` in Antigravity Account Settings.

### Request

Could the team please check the backend entitlement mapping for this Google AI Pro account? It appears `gemini-3.1-flash-image` requests might be evaluating against a 0 IPM free-tier quota rather than the active Google AI Pro plan quota.