dsh-xcodebuild: Xcode Build and Debugging Plugin for DeepSeek Harness

`dsh-xcodebuild` is an iOS/macOS development plugin for DeepSeek Harness, designed to integrate the Xcode toolchain (build, test, and debug) into AI conversation flows. It provides seven core tools: `xcode_doctor`, `xcode_project`, `xcode_destinations`, `xcode_run`, `xcode_log`, `xcode_lldb`, and `xcode_device_log`, supporting environment diagnostics, device management, build execution, log troubleshooting, and LLDB debugging. It automatically displays a build log panel and supports integration with Better Sidebar. The plugin is licensed under the MIT License and supports macOS.