dsh-fishday: Giving Agents Their Own Timeline

dsh-fishday (Xiaoyu's Time and World) is maintained by yanyan-shub and classified as a workflow. It provides DSH Agent with a timeline independent of the conversation, ensuring tasks are performed on time, preventing boredom during silence, and automatically collecting a "My Day" summary at night. Installation is achieved via `plugin_manager install_bundle` targeting the plugin directory. Configuration is handled via the "insert" segment, containing fields such as `eveningHour`, `boredAfterMin`, `keepDays`, and `awakeStart/End`. Data is stored by default at `~/.dsh/fishday/state.json` and supports coordination with an external heartbeat file.