LanguageTool

Build me a local grammar checker to replace LanguageTool Premium. Requirements: - Do not reimplement the checker: run the open-source LanguageTool server locally (the Java 17 jar, skip Docker) on localhost:8081, started by a wrapper script. - A CLI: `check file.md` prints issues with line numbers, grouped by rule category, and exits nonzero when errors are found so it works as a pre-commit hook. - A tiny web page on localhost:4860 (Express, one textarea): paste text, see underlined issues with suggested fixes, click a suggestion to apply it. - Optional LLM rewrite button: send a paragraph plus the LanguageTool findings to Claude or GPT (key in .env) and show the corrected version as a diff. - Personal dictionary in a plain words.txt that the server loads, so my names and jargon stop flagging. - A setup script that downloads the LanguageTool release zip, and optionally the n-gram data. Warn in the README: the n-gram files are about 8 GB but catch far more real errors. - Everything runs locally and works offline except the optional LLM call. No accounts, no telemetry. - Out of scope: browser extensions and the premium-only rules. The open rule set is what we get. - README: Java install, memory flags for the server, and wiring the CLI into git hooks.