Add agentbox plugin to Backend & Architecture
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Adds the agentbox Claude Code plugin (https://github.com/madarco/agentbox, MIT) to Backend & Architecture.
The plugin (.claude-plugin/plugin.json with bundled skills) lets Claude Code drive AgentBox on the host: create isolated sandboxes for coding agents, run them in parallel, queue background jobs, and push via the host relay. Boxes run on local Docker or cloud VMs (Hetzner/Daytona/Vercel/E2B).
README-only entry linking to the external plugin repo, matching the existing external entries in this section (e.g. maestro-orchestrate). The plugin addresses a real use case (sandboxed parallel agents) and doesn't duplicate existing entries.