cli: split banger.go god file into focused files

Pure code motion — banger.go 3508→240 LOC, same-package
decomposition keeps all identifiers visible without export changes.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

internal/cli/commands_daemon.go

@@ -0,0 +1,83 @@
+package cli
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"banger/internal/api"
+	"banger/internal/buildinfo"
+	"banger/internal/paths"
+	"banger/internal/rpc"
+	"banger/internal/system"
+	"banger/internal/vmdns"
+
+	"github.com/spf13/cobra"
+)
+
+func newDaemonCommand() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "daemon",
+		Short: "Manage the banger daemon",
+		RunE:  helpNoArgs,
+	}
+	cmd.AddCommand(
+		&cobra.Command{
+			Use:   "status",
+			Short: "Show daemon status",
+			Args:  noArgsUsage("usage: banger daemon status"),
+			RunE: func(cmd *cobra.Command, args []string) error {
+				layout, err := paths.Resolve()
+				if err != nil {
+					return err
+				}
+				ping, pingErr := daemonPingFunc(cmd.Context(), layout.SocketPath)
+				if pingErr != nil {
+					_, err = fmt.Fprintf(cmd.OutOrStdout(), "stopped\nsocket: %s\nlog: %s\ndns: %s\n", layout.SocketPath, layout.DaemonLog, vmdns.DefaultListenAddr)
+					return err
+				}
+				info := buildinfo.Normalize(ping.Version, ping.Commit, ping.BuiltAt)
+				_, err = fmt.Fprintf(cmd.OutOrStdout(), "running\npid: %d\n%ssocket: %s\nlog: %s\ndns: %s\n", ping.PID, formatBuildInfoBlock(info), layout.SocketPath, layout.DaemonLog, vmdns.DefaultListenAddr)
+				return err
+			},
+		},
+		&cobra.Command{
+			Use:   "stop",
+			Short: "Stop the daemon",
+			Args:  noArgsUsage("usage: banger daemon stop"),
+			RunE: func(cmd *cobra.Command, args []string) error {
+				if err := system.EnsureSudo(cmd.Context()); err != nil {
+					return err
+				}
+				layout, err := paths.Resolve()
+				if err != nil {
+					return err
+				}
+				_, err = rpc.Call[api.ShutdownResult](cmd.Context(), layout.SocketPath, "shutdown", api.Empty{})
+				if err != nil {
+					if os.IsNotExist(err) || strings.Contains(err.Error(), "connect") {
+						_, writeErr := fmt.Fprintln(cmd.OutOrStdout(), "daemon not running")
+						return writeErr
+					}
+					return err
+				}
+				_, err = fmt.Fprintln(cmd.OutOrStdout(), "stopping")
+				return err
+			},
+		},
+		&cobra.Command{
+			Use:   "socket",
+			Short: "Print the daemon socket path",
+			Args:  noArgsUsage("usage: banger daemon socket"),
+			RunE: func(cmd *cobra.Command, args []string) error {
+				layout, err := paths.Resolve()
+				if err != nil {
+					return err
+				}
+				_, err = fmt.Fprintln(cmd.OutOrStdout(), layout.SocketPath)
+				return err
+			},
+		},
+	)
+	return cmd
+}