feat: Artisan checklist for application commands, hints and coverage gate

- migrate, migrate:rollback and deferred:purge gain --pretend and --force;
  they and queue:clear confirm only in production on an interactive
  terminal, so deploys over SSH proceed as before
- result lines: Applied N migrations, Rolled back <id> of <plugin>,
  Cleared N jobs from <queue>
- --json for migrate:status, key:generate, route:list, admin:token:create,
  admin:token:list, admin:token:scopes and websockets:health; -q keeps the
  key and the token
- hints for an empty DSN, an unreachable database, an invalid app.key, a
  missing uploads bucket and an application binary run below its root
- flare and websockets:health return bonfire.Reported after printing
- long help and examples for every application command, greeter:hello and
  blog:publish; cmd/summer TestCommandsDocumented fails on any gap

docs/setup/porting-a-plugin.md

@@ -748,7 +748,12 @@ func PublishCommand(withDB func(ctx context.Context, fn func(*gorm.DB) error) er
 	return bonfire.Command{
 		Name:        "blog:publish",
 		Description: "Publish a blog post by its slug",
-		Args:        []bonfire.Arg{{Name: "slug", Description: "Slug of the post to publish", Required: true}},
+		Long: `Sets published_at on the post with this slug. Publishing a post twice keeps
+the first publication time. It fails when no post has the slug.`,
+		Args: []bonfire.Arg{{Name: "slug", Description: "Slug of the post to publish", Required: true}},
+		Examples: []bonfire.Example{
+			{Command: "blog:publish hello-world", Description: "Publish the post hello-world"},
+		},
 		Run: func(ctx context.Context, in bonfire.Input, out bonfire.Output) error {
 			slug, _ := in.Argument("slug")
 			if slug == "" {