feat: publish FreeRTOS C FC02 card

doc/assets/a2-structure.puml

@@ -0,0 +1,62 @@
+@startuml
+!include card-uml-style.iuml
+scale 900 width
+left to right direction
+
+class "01  WorkerContext" as Worker {
+  +id : uint32_t
+  +result : volatile uint32_t
+  +iterations : volatile uint32_t
+  +trace_state : WorkerTraceState
+  +02 handle : TaskHandle_t
+  +created_handle : uintptr_t
+  +start_tick / end_tick : TickType_t
+  +tcb_address : uintptr_t
+  +stack_low / stack_high : uintptr_t
+  +entry_sp : uintptr_t
+}
+
+class "03  static contexts" as Contexts <<data>> {
+  g_worker_a : WorkerContext
+  g_worker_b : WorkerContext
+  lifetime = whole program
+}
+
+class "04  C entry functions" as Entries <<C ABI>> {
+  sum_task_entry(void*)
+  supervisor_task_entry(void*)
+  create_worker(WorkerContext*)
+}
+
+class "05  SupervisorContext" as Supervisor {
+  first : WorkerContext*
+  second : WorkerContext*
+  handle : TaskHandle_t
+  pass : volatile uint32_t
+}
+
+class "06  common invariants" as Invariants <<contract>> {
+  result A = result B = 200010000
+  iterations A = iterations B = 20000
+  trace contains A -> B -> A
+}
+
+class "heap_4" as Heap <<runtime>> {
+  TCB A / TCB B
+  stack A / stack B
+  supervisor TCB + stack
+}
+
+Contexts *-- Worker : contains two
+Supervisor o-- Worker : observes
+Entries --> Worker : typed context
+Entries --> Supervisor : typed context
+Worker --> Heap : handle value identifies TCB
+Supervisor --> Invariants : verifies
+
+note bottom of Worker
+  Context is application-owned storage.
+  &handle is a field address; handle is its value.
+  Neither is the separate task-stack block.
+end note
+@enduml