Surfer SEO

Build me a content-brief and draft-scoring tool to replace Surfer SEO, personal scale. Requirements: - A Node CLI with two commands: brief "<keyword>" and score <draft.md> "<keyword>". - brief: fetch the top 10 results from Serper.dev (key in .env), download each page, extract title, headings, and body text with cheerio + @mozilla/readability. - Compute across the winners: median word count, recurring H2/H3 topics, and the 30 most frequent meaningful terms via simple tf-idf. No NLP service. - Send that to an LLM (key in .env) to write briefs/<keyword>-YYYY-MM-DD.md: suggested outline, target word count, terms to cover, questions to answer. - score: compare my draft against the brief's term list and outline, print a coverage percentage and a table of missing terms in the terminal. - Cache every SERP response and fetched page in SQLite (better-sqlite3) so re-runs cost zero API credits. - No accounts, no telemetry, everything local except the Serper and LLM calls. - Out of scope: a writing editor with live scoring, site audits, and rank tracking. This outputs Markdown briefs, and page scraping will break on some sites · Serper is the one paid dependency, say both in the README. - README: where to get the Serper key and the rough API cost per brief.