@startuml
skinparam backgroundColor #FFFFFF
skinparam defaultFontName Arial
skinparam defaultFontSize 14
skinparam shadowing false
title Managed Task — lifecycle states from tasks.rs
[*] --> Pending
Pending --> Running : due / delivery eligible
Pending --> Completed : provider done; no callback
Pending --> Failed : provider error
Pending --> Cancelled : owner invalid / key replacement / cancel
Running --> Completed : successful delivery
Running --> Failed : transport or execution error
Running --> Cancelled : cancel / lifecycle cleanup
Completed --> [*]
Failed --> [*]
Cancelled --> [*]
note right of Pending
Provider I/O may already run while the Task
is Pending. Running does not necessarily
mean the I/O starts at that instant.
Scheduler index is weak; callbacks/scopes
are traced managed edges.
end note
@enduml