cli: rewrite help text for AI-driven discovery

Frontier models tend to discover a CLI by running --help, scanning
the Long description, and inferring the dominant workflow from the
examples. Today's banger help reads like a man page index — every
verb has a one-line Short and nothing else. This rewrites the
groups (banger, vm, vm workspace, image, kernel, system,
ssh-config) so each landing page answers "what is this for, what's
the 80% command, what comes next" in three to ten lines, with
runnable examples.

Also disambiguates the near-twin lifecycle commands so a model
reading the subcommand index can tell stop/kill/delete apart at a
glance:

  start    Start a stopped VM
  stop     Stop a running VM gracefully
  restart  Stop then start a VM
  kill     Force-kill a VM (use when 'vm stop' hangs)
  delete   Stop a VM and remove its disks (irreversible)

vm create / vm ssh / vm logs / vm show pick up Long descriptions
and examples for the same reason. No behaviour changes; help text
only.

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

internal/cli/commands_ssh_config.go

@@ -2,6 +2,7 @@ package cli
 
 import (
 	"fmt"
+	"strings"
 
 	"banger/internal/config"
 	"banger/internal/daemon"
@@ -21,7 +22,7 @@ func newSSHConfigCommand() *cobra.Command {
 	)
 	cmd := &cobra.Command{
 		Use:   "ssh-config",
-		Short: "Manage the optional `ssh <name>.vm` shortcut",
+		Short: "Enable plain 'ssh <name>.vm' from any terminal",
 		Long: `Banger keeps a self-contained SSH client config under its own config
 directory (never touching ~/.ssh/config on its own). Opt in to the
 convenience shortcut that lets you run 'ssh <name>.vm' from any
@@ -30,7 +31,15 @@ terminal, bypassing 'banger vm ssh':
   banger ssh-config              # print status + copy-paste snippet
   banger ssh-config --install    # add an Include line to ~/.ssh/config
   banger ssh-config --uninstall  # remove banger's Include from ~/.ssh/config
+
+After --install, 'ssh agent.vm' works the same as 'banger vm ssh
+agent', including for tools like rsync, scp, and editor remotes.
 `,
+		Example: strings.TrimSpace(`
+  banger ssh-config --install
+  ssh agent.vm
+  rsync -avz ./code agent.vm:/root/repo/
+`),
 		Args: noArgsUsage("usage: banger ssh-config [--install|--uninstall]"),
 		RunE: func(cmd *cobra.Command, args []string) error {
 			if install && uninstall {