commit 63acce1b93ea99aab046b51212578e8c58e0f23b
Author: Blake Ridgway <blake@blakeridgway.com>
Date:   Sat Mar 21 17:59:57 2026 -0500

    Initial commit

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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.
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+# arcline-dns — DNS Propagation Checker
+
+Query a domain across global resolvers and diff the results.
+Indispensable during DNS migrations — customers see exactly where propagation stands.
+
+## Stack
+- Language: Go
+- Distribution: single static binary
+- No runtime dependencies
+
+## Resolver list (embedded, configurable)
+- Cloudflare: 1.1.1.1, 1.0.0.1
+- Google: 8.8.8.8, 8.8.4.4
+- OpenDNS: 208.67.222.222
+- Quad9: 9.9.9.9
+- Authoritative nameservers for the queried domain (auto-detected)
+- Configurable: --resolvers flag or .arcline-dns.yaml
+
+## Features
+- [ ] Query A, AAAA, CNAME, MX, TXT, NS, SOA record types
+- [ ] Parallel queries across all resolvers
+- [ ] Diff mode: highlight resolvers that disagree with the majority
+- [ ] TTL display per resolver
+- [ ] --watch N: re-query every N seconds, show changes live
+- [ ] Color-coded: green = matches majority, red = differs, yellow = no response
+
+## CLI interface
+```
+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
+```
+
+## Output format
+```
+$ arcline-dns example.com --type A
+
+  domain   example.com
+  type     A
+  queried  6 resolvers
+
+  resolver            answer          ttl    status
+  ─────────────────── ─────────────── ────── ───────
+  1.1.1.1 (CF)        203.0.113.42    300s   [OK]
+  1.0.0.1 (CF)        203.0.113.42    300s   [OK]
+  8.8.8.8 (Google)    203.0.113.42    300s   [OK]
+  8.8.4.4 (Google)    203.0.113.42    300s   [OK]
+  208.67.222.222      203.0.113.10    300s   [DIFF]
+  9.9.9.9 (Quad9)     203.0.113.42    300s   [OK]
+
+  propagation   5/6 resolvers agree
+```
+
+## Tasks
+- [ ] Project scaffold
+- [ ] Embedded resolver list
+- [ ] Parallel DNS query engine (net package, raw UDP)
+- [ ] Record type parser (A, AAAA, CNAME, MX, TXT, NS, SOA)
+- [ ] Diff/majority logic
+- [ ] Table renderer (terminal + JSON)
+- [ ] --watch mode with delta display
+- [ ] Authoritative NS auto-detection
+- [ ] Cross-compile Makefile
+- [ ] README