dsh-planner-executor: A DeepSeek Harness Plugin for Decoupled Planning and Execution

The DeepSeek Harness plugin `dsh-planner-executor` decouples planning from execution through a role-separation mechanism, aiming to optimize the main model's token consumption and improve flexibility. Core features include: the main model handles analysis, planning, and summarization, while sub-agents execute specific tasks in independent sessions via the `delegate_execution` tool, with configurable independent models, permissions, and recursion limits. The plugin supports "spawn" and "fork" modes, requires no build dependencies, and is suitable for long-chain task processing or heterogeneous main/sub-model scenarios, effectively improving task-processing efficiency and resource utilization.