tl;dr: QM is a multiplayer AI agent harness aimed at startups, providing per-user isolated workspaces plus shared collaboration in Slack channels, group chats, and projects, each with scoped memory, files, permissions, and sandboxes. It's model- and harness-agnostic (Pi, OpenCode, Codex, Claude Code), runs on Node/Fastify with Postgres, and supports custom internal web apps, cron/background tasks, shared skills, and configurable security postures with audited actions. Deployments run in the operator's own cloud via a CLI, with an MIT license and a contribution model that takes human-written text specs rather than code PRs.