ruazero/dsh-task-chime: Task Chime Plugin for DeepSeek Harness

`ruazero/dsh-task-chime` is a DeepSeek Harness plugin that plays audio through the host operating system process, ensuring users remain aware of task status (completed or awaiting input) when an agent runs in the background or the window is minimized. It provides 13 sound effects, four-level intensity control, an automatic escalation mechanism, and on-demand trigger tools. It supports both configuration package (permanent) and dynamic plugin (temporary) modes, effectively addressing the lack of auditory feedback during background operation.