@startuml
!include card-uml-style.iuml
scale 900 width
top to bottom direction

class "01  workerA context\n.data / .bss" as Context <<application storage>>
class "02  &handle / handle\nfield address / opaque value" as Handle <<public API>>
class "03  TCB\nheap_4" as TCB <<kernel internal>>
class "task stack\nheap_4" as Stack <<runtime>>
class "04  callback ABI\na0 = &workerA" as ABI <<CPU>>
class "05  scheduling evidence\nPC · tick · A/B/A trace" as Schedule <<Hazard3>>
class "06  final evidence\nresult + source + E12" as Evidence <<verified>>

Context -right-> Handle : field value
Handle -right-> TCB : identifies
TCB -right-> Stack : points to separate block
ABI -right-> Schedule : PC / tick
Schedule -right-> Evidence : verified E12
Context -[hidden]down-> ABI
ABI --> Context : exact address
ABI --> Stack : SP inside range
Stack --> Schedule : restored execution

note bottom of TCB
  Debugger may inspect the TCB address.
  Application assertions use public APIs only.
  Saved addresses are forensic after self-delete.
end note
@enduml