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. Read it live from the OS on Windows (`powershell [Environment]::GetEnvironmentVariable('REXAI_API_KEY','Machine')`) — a bash/PowerShell session started before the key was set holds a stale snapshot. 2. Choose the product ID (verify against the current instance's product list with one probe; these IDs have drifted before): - Text-to-image: `gpt-image-2`. - Image-to-image: **the same `gpt-image-2` product with the `-Image` parameter** — the relay selects the image-to-image route when the body carries `images`. `gpt-image-2-i2i` does NOT exist (`404 image_product_not_found`); do not use it. 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: ```powershe...