docs: update README descriptions and fix CLI casing

README.en.md

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-Open-source CLI agent that autonomously writes, audits, and revises novels — with human review gates that keep you in control. Supports LitRPG, Progression Fantasy, Isekai, Romantasy, Sci-Fi, and more. Continuation, spinoff, fanfic, and style imitation workflows built in.
+Open-source CLI AI Agent that autonomously writes, audits, and revises novels — with human review gates that keep you in control. Supports LitRPG, Progression Fantasy, Isekai, Romantasy, Sci-Fi, and more. Continuation, spinoff, fanfic, and style imitation workflows built in.
 
 **Native English novel writing now supported！** — 10 built-in English genre profiles with dedicated pacing rules, fatigue word lists, and audit dimensions. Set `--lang en` and go.
 

README.md

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-Agent 写小说。写、审、改，全程接管。覆盖玄幻、仙侠、都市、科幻等多种风格，支持续写、番外、同人、仿写等创作形式。
+AI Agent 自主写小说——写、审、改，全程接管。覆盖玄幻、仙侠、都市、科幻等多种风格，支持续写、番外、同人、仿写等创作形式。人工审核门控确保你始终掌控全局。已发布为 [OpenClaw](https://clawhub.ai) skill。
 
 **Native English novel writing now supported！** Set `--lang en` to write in English. See [English README](README.en.md) for details.