dsh-git-conventions: Configuring Git commits, pushes, and PR conventions for DeepSeek Harness

dsh-git-conventions is a static plugin for DeepSeek Harness used to automatically perform Git commit, push, and PR convention checks. It supports configurable rules covering the `git commit`, `git push`, and `gh pr create` commands. Core features include: validating the Conventional Commits structure for `-m` inline commit messages and rejecting non-compliant ones; prompting the use of `--force-with-lease` instead of bare `--force` pushes when security options are enabled; and enforcing that `gh pr create` must include a title and description, intercepting if they are missing. Plugin rules are configured and persisted via the settings page and support both Chinese and English. If rules are left unconfigured...