feat: publish FreeRTOS C FC02 card

scripts/check_abi.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env sh
+set -eu
+
+nm=${RISCV_NM:-riscv64-unknown-elf-nm}
+readelf=${RISCV_READELF:-riscv64-unknown-elf-readelf}
+elf=build/task01_first_task/prog.elf
+
+if "$nm" --defined-only "$elf" | awk '{print $3}' | grep -Eq '^_Z|^__cxa_|^_Unwind_'; then
+  echo "unexpected C++ or unwind symbol in the C teaching ELF" >&2
+  exit 1
+fi
+
+if "$readelf" -S "$elf" | grep -Eq '\.init_array|\.eh_frame|\.gcc_except_table'; then
+  echo "unexpected C++ initialization or unwind section in $elf" >&2
+  "$readelf" -S "$elf" >&2
+  exit 1
+fi
+
+for symbol in sum_task_entry supervisor_task_entry task01_debug_checkpoint task01_debug_checkpoint_committed xTaskCreate vTaskDelete; do
+  if ! "$nm" --defined-only "$elf" | grep -Eq "[[:space:]]${symbol}$"; then
+    echo "required C/FreeRTOS symbol is missing: $symbol" >&2
+    exit 1
+  fi
+done
+
+echo "PASS ABI: freestanding C11 task callback, no C++ runtime or mangled symbols"