Bug: folder variable not passed from codex module to agentapi module

[matthazinski]

When using the codex module with a custom folder parameter, the specified folder path is not being passed to the underlying agentapi module. This causes the module to use the agentapi default value of /home/coder instead, resulting in permission errors when that directory doesn't exist or isn't accessible.

Steps to Reproduce

1. Configure the codex module with a custom folder path:

module "codex" {
  source   = "registry.coder.com/coder-labs/codex/coder"
  version  = "2.1.0"
  agent_id = coder_agent.dev.id
  folder   = "/home/matt/foobar"  # Custom folder path
  openai_api_key = var.openai_api_key
  ai_prompt = data.coder_parameter.ai_prompt.value
}

2. Create or start a Coder workspace using this template

3. Check the workspace startup logs

Expected Behavior

The codex module should initialize and run in the user-specified folder (/home/matt/foobar).

Actual Behavior

The module attempts to use /home/coder instead and fails with a permission error:

Warning: The specified folder '/home/coder' does not exist.
Creating the folder...
mkdir: cannot create directory '/home/coder': Permission denied