🔗 https://github.com/craig-atr/folder-cartographer 🗺️ FOLDER-CARTOGRAPHER — a drop-in Claude folder that walks a body of work someone will change and leaves behind a map a cold reader can wander: a catalog.md (the front door) plus one card per noun. You point it at a repo, a vendor portal, a delivery folder; it inventories the nouns, marks each live / leftover / ghost, and writes cards that say what the thing is, what else moves if you touch it, and the one neighbour everyone wrongly assumes it touches — citing file:line instead of copying the source. Its whole discipline is catalog → one card → stop: it hands you the shelf, it does not photocopy the library. It is not a tour, an audit, or a diagnostician — it marks a ghost, it does not scold it or explain a failure. 🔁 IT WORKS ON ANY FOLDER — PROVEN ON EIGHT REAL CODEBASES — from an Android app to public frameworks, no per-repo tuning. Four are territories I own, with nothing in common: vendor-lilly (a multi-tenancy spine whose payoff is "not every request goes through tenant middleware — these four routes don't"); atomic-tattoo-removal, where the map's reason to exist is that three backends live in one repo and never touch each other (Express booking, Firestore-from-the-browser admin, external CRM); astanza-crm, a big, messy CRM where most of the repo is not the app — a tiny 7-noun spine that marks a superseded server.original.js and the drawer of one-off scripts as leftover and an empty index config as a ghost; and arnold, a Kotlin/Android app, where the map shows interface-vs-impl wired once in MainActivity, quarantines the old Node app as a leftover, and flags a first-launch migrator that is green in tests but called by no production path as a ghost. A reader who assumes "the backend" is one thing, or that every file that runs is live, ships the wrong change; the map is what stops them. And it isn't only proven on repos I own: the same folder maps three public frameworks a judge can clone and re-check — Express (a routing spine), Commander (a CLI parser), Fastify (a plugin system) — plus linkstash, a small self-contained territory shipped inside the receipt so the citation and live-wiring gates run green with no clone at all. Same rules, eight real codebases.