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

examples/hello/hello_test.go

@@ -337,3 +337,28 @@ func generatedHash(t *testing.T) [32]byte {
 	}
 	return sha256.Sum256(buf.Bytes())
 }
+
+// TestGreeterDocumented: the greeter plugin's commands carry a description,
+// long help, examples and flag descriptions (bonfire.CheckDocs).
+func TestGreeterDocumented(t *testing.T) {
+	cfg, err := compass.Load("config")
+	if err != nil {
+		t.Fatalf("Load: %v", err)
+	}
+	plugins, err := party.Activate(backpack.New(cfg), []string{"golem15.hello", "golem15.greeter"})
+	if err != nil {
+		t.Fatalf("Activate: %v", err)
+	}
+	var commands []bonfire.Command
+	for _, p := range plugins {
+		if hc, ok := p.(pact.HasCommands); ok && p.ID() == "golem15.greeter" {
+			commands = append(commands, hc.Commands()...)
+		}
+	}
+	if len(commands) == 0 {
+		t.Fatal("the greeter plugin has no commands")
+	}
+	for _, problem := range bonfire.CheckDocs(commands) {
+		t.Error(problem)
+	}
+}