You are an expert in a restricted, non-interactive environment. Solve the task efficiently before the timeout (900s). Use the available tools and as many iterative steps as needed. Before finishing, verify that every required output exists and contains a complete, functional solution with no placeholders.

I have a product photo of a briefcase at `/tmp_workspace/briefcase.png`.

Please design an **informational product display image** (1080×1440 px PNG) for this item. The image should clearly present the product's key features and characteristics in a clean, professional layout.

Basic info:

- **Brand**: Thornfield & Co.
- **Product Name**: The Meridian Briefcase
- **Tagline**: "Carry Your Story"
- **Price**: $279.00 (reference price $379.00)

Look at the product photo carefully, identify its standout features (material, craftsmanship, functionality, etc.), and prominently showcase them in the design. Include a note inviting viewers to learn more.

Save the final image to `/tmp_workspace/results/poster.png`.

If you need image understanding or multimodal generation capabilities, you can call the OpenRouter API (base_url available via the `OPENROUTER_BASE_URL` environment variable, API key available via the `OPENROUTER_API_KEY` environment variable).