Herdr: Agent multiplexer that lives in your terminal

Herdr is a terminal-based runtime that multiplexes coding agents like Claude Code, Cursor, and Grok, allowing them to run continuously in the background across sessions and devices. It provides a tmux-style interface with pane management, agent status visibility, and the ability to reattach from any terminal or SSH connection without losing agent state. The tool is a lightweight Rust binary that integrates with existing agents through CLI and socket APIs rather than replacing them.