leisure-time-queue: DeepSeek Harness Idle-time Task Queue Plugin

The leisure-time-queue plugin enables users to configure DeepSeek Harness to run tasks in batches during system idle periods. Installation requires the specified CLI version and a Harness restart. The plugin provides a sidebar entry point and supports configuring recurring weekly execution windows, managing sessions, and performing FIFO queue operations. Users can quickly create tasks from the current session or create new tasks, with both global and individual policy overrides supported. Task execution depends on meeting specific conditions and requires the DSH process to remain running. The plugin supports pausing, resuming, canceling, retrying, and editing tasks, ensuring tasks are processed persistently in the background.