@startuml
!theme plain
title Artifact Editor MVP - State Machine

[*] --> EDITING : launch

state EDITING : User modifying code
state RENDERING : PlantUML subprocess
state PREVIEW : Showing rendered result
state ERROR : Render failed
state SAVED : File written

EDITING --> RENDERING : timer/trigger
RENDERING --> PREVIEW : success
RENDERING --> ERROR : fail/timeout
ERROR --> EDITING : edit
PREVIEW --> EDITING : edit
EDITING --> SAVED : save
SAVED --> [*] : output contract

note right of RENDERING
  Timeout: 10s
  Show spinner
end note

note right of SAVED
  stdout: ARTIFACT_SAVED:path
  exit 0
end note

@enduml