rexai-image-generation

# RexAI Image Generation Use RexAI's async image API to create images and return usable local files. ## Quick Workflow 1. Use `REXAI_API_KEY` for authentication. If it is missing, teach the user how to configure it for their platform before running the job. 2. Choose the product ID: - Text-to-image: `gpt-image-2`. - Image-to-image: `gpt-image-2-i2i`. 3. Pick the zero-install executor for the user's platform: - Windows/Codex: use `scripts/rexai-image.ps1`; it only needs built-in PowerShell/.NET. - macOS/Linux: use `scripts/rexai-image-macos.sh`; it uses common system tools (`bash`, `curl`, `perl`, `base64`). 4. Use `scripts/rexai-image.mjs` only when Node is already available. 5. Report the local file path, job id, source URL if present, and expiry time if present. Read `references/api.md` when you need endpoint details, supported sizes, error codes, or examples. ## API Key Setup First check whether the key is already available. Do not print the key value: ```powershell if ($env:REXAI_API_KEY) { "REXAI_API_KEY is set" } else { "REXAI_API_KEY is missing" } ``` If it is missing, tell the user to choose one setup path: Windows PowerShell, current session only: ```powershell $env:REXAI_API_KEY = "cr_xxx" ``` Windows PowerShell, persistent for new terminals: ```powershell setx REXAI_API_KEY "cr_xxx" ``` macOS/Linux, current shell only: ```bash export REXAI_API_KEY="cr_xxx" ``` macOS zsh, persistent for new terminals: ```bash printf '%s\n' 'export REXAI_A...