dsh-plain-talk: Add a "plain talk" switch for DSH replies

dsh-plain-talk is a reply optimization plugin for DSH maintained by lizilong1993. It falls under the Model Inference category, has 1 star, and is licensed under MIT. It adds a toggle switch to the input box; when enabled, it constrains replies via system prompts to state the conclusion first, limit the length to no more than 12 lines or 300 characters, avoid pronouns, quote the original text, and explain code or experiment names upon their first appearance, while maintaining a local vocabulary list. The article provides three installation commands (npm/GitHub/local), session-level toggles, and the PLAIN_TALK_DEFAULT configuration, as well as the plain_talk_check self-check tool and glossary maintenance methods, and explains the working principle, data permissions, and precautions. The plugin runs with the current DSH process permissions, and the source code and license should be reviewed before installation.