Update mcdsl from v1.0.0 to the port-env-support branch tip, which adds
$PORT environment variable support. Adapt grpcserver.New call to the new
Options parameter (nil for default chain).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Replace the CoreDNS precursor with a purpose-built authoritative DNS
server. Zones and records (A, AAAA, CNAME) are stored in SQLite and
managed via synchronized gRPC + REST APIs authenticated through MCIAS.
Non-authoritative queries are forwarded to upstream resolvers with
in-memory caching.
Key components:
- DNS server (miekg/dns) with authoritative zone handling and forwarding
- gRPC + REST management APIs with MCIAS auth (mcdsl integration)
- SQLite storage with CNAME exclusivity enforcement and auto SOA serials
- 30 tests covering database CRUD, DNS resolution, and caching
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
