Sets up the package layout for a CoreDNS plugin that will accept RFC 2136
dynamic updates with TSIG authentication, primarily targeting self-hosted
ACME DNS-01 cert automation.
What this commit gives us:
- go.mod against coredns/caddy v1.1.4, coredns/coredns v1.14.3, miekg/dns v1.1.72
- plugin.go: RFC2136 struct + Handler interface (ServeDNS is pass-through)
- setup.go: init() registration + Corefile parser (skeleton — recognizes
tsig-key, ttl, persist directives but doesn't yet wire them)
- README.md, .gitignore
go build ./... clean. No tests yet — those come with Phase 1.2 alongside
the actual UPDATE handler and in-memory store.
Plan: ~/.claude/plans/dood-does-coredns-offer-enumerated-piglet.md
