Show HN: Paneflow – cross-platform GPUI app for parallel coding agents

- **GPUI** is a high-performance, GPU-accelerated Rust UI framework being developed by the company Zed Industries (makers of the Zed code editor). It uses the GPU for rendering, enabling very fast, smooth interfaces. - **Paneflow** is a new open-source app (by developer ArthurDEV44) built with GPUI. It lets you run multiple AI coding agents side-by-side in resizable panels, each working on different parts of a project simultaneously. - **Parallel coding agents** refer to instances of AI tools (like GitHub Copilot, Cursor, or Claude-powered coding assistants) that can each independently edit code. Paneflow lets you orchestrate several of them at once, each with its own context and files. - This matters because it points to a workflow where AI agents collaborate like a team of human engineers, potentially speeding up development. It also demonstrates GPUI being used outside of Zed itself, showing the framework's maturity as a general-purpose toolkit.