DeepSeek Harness Plugin: narrative-prompt-polish

`narrative-prompt-polish` is a prompt polishing plugin for DeepSeek Harness (DSH), designed to address insufficient clarity in drafts. Users can click the `✨` in the bottom-right corner of the main box to invoke a conversational sub-agent for multi-round follow-up optimization, then manually copy and paste the result back once satisfied. The plugin supports Prompt Cache–optimized computation and includes built-in intent classification and safe write-back mechanisms to prevent accidental operations. The repository has now been migrated to `dsh-prompt-only-forge` and depends on the DSH kernel’s sub-agent orchestration service.