Bump mcdsl to f94c4b1 for $PORT env var support

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>

go.mod

@@ -3,7 +3,7 @@ module git.wntrmute.dev/kyle/mcns
 go 1.25.7
 
 require (
-	git.wntrmute.dev/kyle/mcdsl v1.0.0
+	git.wntrmute.dev/kyle/mcdsl v1.0.2-0.20260327074919-f94c4b1abf9c
 	github.com/go-chi/chi/v5 v5.2.5
 	github.com/miekg/dns v1.1.66
 	github.com/spf13/cobra v1.10.2

go.sum

@@ -1,5 +1,5 @@
-git.wntrmute.dev/kyle/mcdsl v1.0.0 h1:YB7dx4gdNYKKcVySpL6UkwHqdCJ9Nl1yS0+eHk0hNtk=
-git.wntrmute.dev/kyle/mcdsl v1.0.0/go.mod h1:wo0tGfUAxci3XnOe4/rFmR0RjUElKdYUazc+Np986sg=
+git.wntrmute.dev/kyle/mcdsl v1.0.2-0.20260327074919-f94c4b1abf9c h1:DoSa9jdpMhFgxQlQSqe9Bgg8G4vQzH/CQO1KJR39abs=
+git.wntrmute.dev/kyle/mcdsl v1.0.2-0.20260327074919-f94c4b1abf9c/go.mod h1:wo0tGfUAxci3XnOe4/rFmR0RjUElKdYUazc+Np986sg=
 github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
 github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/cpuguy83/go-md2man/v2 v2.0.6/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=

internal/grpcserver/server.go

@@ -24,7 +24,7 @@ type Server struct {
 
 // New creates a configured gRPC server with MCNS services registered.
 func New(certFile, keyFile string, deps Deps, logger *slog.Logger) (*Server, error) {
-	srv, err := mcdslgrpc.New(certFile, keyFile, deps.Authenticator, methodMap(), logger)
+	srv, err := mcdslgrpc.New(certFile, keyFile, deps.Authenticator, methodMap(), logger, nil)
 	if err != nil {
 		return nil, err
 	}