feat: publish FreeRTOS C FC03 card

doc/assets/a7-runtime.puml

@@ -0,0 +1,56 @@
+@startuml
+!include card-uml-style.iuml
+scale 900 width
+left to right direction
+
+class "01  timer CSRs" as Timer <<runtime>> {
+  mtime
+  mtimecmp
+  mcause = 0x80000007
+  mepc = interrupted task PC
+}
+
+class "02  ISR evidence" as ISR <<runtime>> {
+  first_tick_count
+  ISR sp
+  one-shot tick checkpoint
+}
+
+class "03  scheduler evidence" as Kernel <<debugger only>> {
+  Ready lists by priority
+  selected TCB
+  tick count
+}
+
+class "04  peer runtime" as Peer <<runtime>> {
+  context address
+  handle / TCB
+  task stack range
+  PC · SP · priority 2
+}
+
+class "05  high runtime" as High <<runtime>> {
+  handle / TCB
+  priority 0 → 3
+  PC · SP · run_tick
+}
+
+class "06  committed evidence" as Evidence <<application>> {
+  switch trace A · B · A
+  markers before · HIGH · after
+  source blob · ELF hash
+  PASS
+}
+
+Timer --> ISR : machine-timer trap
+ISR --> Kernel : scheduling opportunity
+Kernel --> Peer : equal-priority rotation
+Kernel --> High : select after priority raise
+Peer --> Evidence
+High --> Evidence
+
+note bottom of Kernel
+  Kernel internals are debugger observations only.
+  Program assertions use public API and application records.
+end note
+@enduml