dsh-workspace-merge: Merging Multiple Local Project Root Directories into Unified Operations

The DSH plugin `dsh-workspace-merge` solves the path and synchronization challenges involved in working with projects in sibling directories—such as PC and mobile versions or cross-platform applications—within a single session. It introduces the concept of “workspace groups,” treating relative paths as unified operations across groups. Core features include batch reading, diff comparison, and literal replacement across directories through the `ws_*` tool suite, including `ws_ls`, `ws_read`, `ws_edit`, and `ws_diff`. The plugin supports multiple sandbox permission modes, allowing users to configure groups flexibly and audit changes, making it an effective tool for non-Monorepo, multi-project collaboration.