dsh-local-superagent: Embedding the Superagent task board into the DSH workspace

The DSH community plugin maintained by superchao5717 provides a local Superagent task board: Users arrange tasks in the workspace, while Host code is deterministically dispatched to independent worker sessions for execution. Persistent supervisor sessions review work based on acceptance criteria, only pushing issues to users when "needs_you" is triggered. It supports features such as master-slave session isolation, structured reporting, model injection per session, task attachments (v0.5.0), supplementary requirements and linking to new sessions (v0.6.0), and restart recovery. Installation is via `github:superchao5717/dsh-local-superagent#v0.6.0`, requires Node.js >= 22, and has been verified on physical machines running Windows / DSH 0.2.1-rc.5. Note that multiple supervisors do not provide file isolation, and timeout auto-recovery cannot bypass human permission steps.