dsh-chime: Make DeepSeek Harness Web GUI play a ding-dong when a task is completed

## Preface When running agent tasks via the dsh Web interface, a common workflow is to "send the command, switch to do other things, and later switch back to check on progress." Switching too early results in idle waiting, while switching too late means the task has already stopped and is waiting for your input. dsh-chime is designed for this exact scenario: as soon as the current session's task ends, a chime plays in the browser, eliminating the need to stare at the page. The philosophy of DSH is "everything is a plugin," making such small interface enhancements ideal for plugin-based completion. Below is an introduction to the positioning, features, and usage of dsh-chime. ## What is this dsh-chime (GitHub repository `mystery-god/dsh-chime`) is for the DeepSeek Harness Web GUI