schema rejects valid custom provider model in top-level model field

Description

The schema https://opencode.ai/config.json depends on a giant enum from models.dev

"model": {
          "type": "string",
          "description": "Model to use in the format of provider/model, eg anthropic/claude-2",
          "$ref": "https://models.dev/model-schema.json#/$defs/Model"
        }

When creating a custom provider, this results in a schema validation error. Example minimal opencode.json:

{
  "$schema": "https://opencode.ai/config.json",
  "provider": {
    "internal": {
      "npm": "@ai-sdk/openai-compatible",
      "models": {
        "Qwen/Qwen3-Coder-30B-A3B-Instruct": {}
      }
    }
  },
  "model": "internal/Qwen/Qwen3-Coder-30B-A3B-Instruct"
}

Custom providers should be valid.

Plugins

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OpenCode version

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Steps to reproduce

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Screenshot and/or share link

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Operating System

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Terminal

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