I kept hitting a wall around 8 concurrent agents — not a compute problem, a working memory problem. Wrong terminal, missed input prompt, confused branches. So I built SlayZone: each kanban card hides a terminal, tasks get isolated git worktrees, and the board shows which agents are idle, working, or waiting for you. Open source. My personal record is 25 agents without losing track — curious what yours is, and what I should build next.