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README.md

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+# arcline-dns
+
+DNS propagation checker. Queries a domain across multiple global resolvers in parallel and diffs the results — shows exactly where propagation stands during a DNS migration.
+
+## Status
+
+Planned. Not yet started.
+
+## Stack
+
+- Go — single static binary, no runtime dependencies
+- Embedded resolver list (Cloudflare, Google, OpenDNS, Quad9, authoritative NS)
+
+## Usage
+
+```sh
+arcline-dns example.com
+arcline-dns example.com --type MX
+arcline-dns example.com --type A --watch 30
+arcline-dns example.com --resolvers 8.8.8.8,1.1.1.1
+arcline-dns example.com --json
+```
+
+## Features
+
+- Parallel queries across all resolvers
+- Supports A, AAAA, CNAME, MX, TXT, NS, SOA
+- Diff mode: highlights resolvers that disagree with the majority
+- TTL per resolver
+- `--watch` mode: re-queries on an interval, shows changes live
+- Color-coded output: green = agrees, red = differs, yellow = no response
+
+See [todo.md](todo.md) for the full task list and output format spec.