dsh-stage-presence: Dance Learning Plan Generation Tool

`dsh-stage-presence` is a DeepSeek Harness (DSH) plugin intended to provide agents with stage presence and dance learning solutions. Developers can install it via the command line and use its registered `stage_presence` tool to directly retrieve dance instructional plans based on parameters. The plugin is a pure Node.js implementation, depends on a specific environment, and runs with the permissions of the current process.