@startuml
!include card-uml-style.iuml
scale 900 width
left to right direction

class "01  PeerContext [2]" as Peers <<C struct>> {
  id : uint32_t
  configured_priority : UBaseType_t = 2
  handle : TaskHandle_t
  iterations · checksum
  first_tick · last_tick
  entry_sp · stack range
}

class "02  HighProbeContext" as Probe <<C struct>> {
  initial_priority = 0
  target_priority = 3
  handle : TaskHandle_t
  run_tick
  ran_before_caller_returned
}

class "03  VerifierContext" as Verify <<C struct>> {
  configured_priority = 1
  handle : TaskHandle_t
  pass
}

class "04  switch trace" as SwitchTrace <<bounded record>> {
  task[16]
  tick[16]
  count · changes
  captured A · B · A
}

class "05  preemption markers" as OrderTrace <<bounded record>> {
  1 = before_raise
  2 = high_probe
  3 = after_raise
}

Peers --> SwitchTrace : one entry per observed task change
Peers --> Probe : vTaskPrioritySet(handle, 3)
Probe --> OrderTrace : marker 2
Peers --> OrderTrace : markers 1 and 3
Verify --> Peers : checks both
Verify --> Probe : checks preemption proof

note bottom of SwitchTrace
  A→B→A is a committed subsequence.
  Repeated loop iterations are not logged.
end note
@enduml