feat(01-03): add deterministic rich CLI output

- Inject bonfire.Output from stdin/stdout/stderr with stdlib widgets and x/term
- Degrade spinner, progress, table and prompts without a TTY or color
- Reject plugin command names that are not namespace:verb

go.mod

@@ -11,6 +11,7 @@ require (
 	github.com/knadh/koanf/providers/file v1.2.1
 	github.com/knadh/koanf/v2 v2.3.6
 	github.com/spf13/cobra v1.10.2
+	golang.org/x/term v0.46.0
 )
 
 require (
@@ -22,5 +23,5 @@ require (
 	github.com/mitchellh/reflectwalk v1.0.2 // indirect
 	github.com/spf13/pflag v1.0.9 // indirect
 	go.yaml.in/yaml/v3 v3.0.4 // indirect
-	golang.org/x/sys v0.32.0 // indirect
+	golang.org/x/sys v0.48.0 // indirect
 )