dsh-smarter-edit: A More Reliable File Editing Solution for DSH

The `dsh-smarter-edit` plugin replaces DeepSeek Harness's native `edit` tool with a Codex-compatible `apply_patch`, resolving code-editing failures caused by format mismatches and excessive token consumption. It supports multiple patch blocks, various file operations, and atomic rollback. After installation, the Profile must be restarted, and the model can then send patches using standard diff syntax; the plugin automatically applies the changes and rolls them back if a patch fails.