feat(opencode): add config options to enable and disable models

[KelvinJRosado]

What does this PR do?

Closes #9203

This adds both a disabled_models and a enabled_models option to help give better control over which models are shown. Supports both full IDs as well as glob patterns. These options mirror how the enabled_providers and disabled_providers options set precedence.

This is useful in situations like Enterprises where only certain models are allowed for use, even though a provider may expose more. For example, this can allow for disabling preview models. Or to only allow OpenAI codex models for a cleaner view.

How did you verify your code works?

I verified that all tests passed and also verified the functionality locally. Used the following config options to try it out locally with bun dev:

  "enabled_models": {
    "openai": ["gpt-5.2-codex"],
    "opencode": ["claude-sonnet-4-5"]
  },
  "disabled_models": {
    "google": ["gemini-1*"]
  }

And that gave me the following result with my setup:

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

No duplicate PRs found.

[KelvinJRosado]

Adding screenshots for additional testing I did with these options. Used the following config:

{
  "$schema": "https://opencode.ai/config.json",
  "enabled_providers": ["openai", "opencode", "google"],
  "model": "openai/gpt-5-2-codex",
  "small_model": "openai/gpt-5-1-codex-mini",
  "default_agent": "plan",
  "compaction": {
    "auto": true,
    "prune": true
  },
  "enabled_models": {
    "openai": ["gpt-5.*-codex*"],
    "opencode": ["claude-sonnet-4-5"],
    "google": ["gemini-2*"]
  },
  "disabled_models": {
    "google": ["*preview*"]
  }
}

This gives us the following options in the /models list:

This shows how we can restrict the models per provider. In this case, disabling preview models from the Google provider and ensuring we only use the 2* series. We also limit Zen to just 1 model, and OpenAI to the 5.* codex models

[KelvinJRosado]

I believe this is in a good state to review now. But not sure how to go about doing that 😅

[KelvinJRosado]

Cleaned this up to remove some redundant tests, reducing the size