dsh-improve-prompt: One-Click Rewrite of Prompt Drafts for Direct Agent Execution

The `dsh-improve-prompt` plugin uses a local LLM to rewrite colloquial drafts in the input box into prompts with clear structure and explicit instructions. Its core features include a fidelity gate (preserving hard facts), a length gate (limiting output expansion), and a one-click rewrite/undo mechanism. The plugin supports slash commands, intelligent context carryover, and HTTP API integration. It can invoke DSH’s built-in model without configuration, automatically preserves the original text on failure, and ensures that user input remains completely safe.