Add the tier 3 utility IRC commands (closes #87)

USERHOST, VERSION, ADMIN, INFO, TIME, KILL and WALLOPS on both the
HTTP API and the IRC listener, and user mode +w.

Model: opus-5-5

internal/ircserver/export_test.go

@@ -4,10 +4,12 @@ import (
 	"context"
 	"log/slog"
 	"net"
+	"time"
 
 	"sneak.berlin/go/neoirc/internal/broker"
 	"sneak.berlin/go/neoirc/internal/config"
 	"sneak.berlin/go/neoirc/internal/db"
+	"sneak.berlin/go/neoirc/internal/globals"
 	"sneak.berlin/go/neoirc/internal/service"
 )
 
@@ -19,8 +21,14 @@ func NewTestServer(
 	database *db.Database,
 	brk *broker.Broker,
 ) *Server {
+	globs := &globals.Globals{
+		Appname:   "neoirc",
+		Version:   "test",
+		StartTime: time.Now(),
+	}
+
 	svc := service.NewTestService(
-		database, brk, cfg, log,
+		database, brk, cfg, globs, log,
 	)
 
 	return &Server{ //nolint:exhaustruct
@@ -47,3 +55,21 @@ func (s *Server) Stop() {
 func (s *Server) Listener() net.Listener {
 	return s.listener
 }
+
+// NewTestConn wraps an already-established net.Conn in a
+// Conn so tests can drive connection-level behaviour such
+// as Disconnect without standing up a whole server.
+func NewTestConn(
+	log *slog.Logger,
+	cfg *config.Config,
+	tcpConn net.Conn,
+	nick string,
+) *Conn {
+	conn := newConn(
+		context.Background(), tcpConn, log,
+		nil, nil, cfg, nil,
+	)
+	conn.nick = nick
+
+	return conn
+}