dsh-plugin-codex-bridge: A Collaboration Bridge Between Codex and DeepSeek Harness

DeepSeek Harness (DSH) sessions follow a single-writer constraint. The plugin provides a collaboration channel for external drivers such as Codex through a "lock-held host relay" mechanism. It does not handle code generation; it only manages communication and synchronization. Its core features include workspace synchronization and file delivery, session message delivery, and Git status return. Together with the `codex2dsh` skill on the Codex side and the `dsh2codex` skill on the DSH side, it establishes a complete closed loop from task registration and development implementation to result review. Installation requires enabling the plugin and keeping DSH running. Notes cover permission security, concurrency risks, and platform compatibility.