textlens: zero-dependency TypeScript library & CLI for text analysis. Runs 100% locally, no API calls. 8 readability formulas (Flesch, Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau, ARI, Dale-Chall, Linsear Write) with consensus grade. AFINN-165 sentiment analysis. TF keyword extraction with stopword filtering. Keyword density (unigram/bigram/trigram). SEO scoring with actionable suggestions. Reading time estimation. Extractive summarization. CLI with pretty, JSON & minimal output.