feat(L01): add BusyBox multicall console card

tools/card-action.sh

@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+set -euo pipefail
+action="${1:?action is required}"
+root="${STEM_REPO:-${CARD_ROOT:-$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")/.." && pwd)}}"
+profile="${STEM_PROFILE:-native-amd64}"
+target="${STEM_TARGET:-native}"
+selector="${STEM_TASK:-task1}"
+tasks=(task01_multicall_dispatch task02_files_and_text task03_process_and_host)
+resolve_task() {
+  local value="${1,,}" task_name
+  for task_name in "${tasks[@]}"; do [[ "$value" == "$task_name" ]] && { printf '%s\n' "$task_name"; return; }; done
+  [[ "$value" =~ ^(task|t)?[-_]?0*([1-3])($|[-_].*) ]] && { printf '%s\n' "${tasks[${BASH_REMATCH[2]} - 1]}"; return; }
+  printf 'Unknown task selector: %s\n' "$1" >&2; exit 2
+}
+task="$(resolve_task "$selector")"
+artifact_dir="$root/.stem/artifacts/$profile/$target/$task"
+mkdir -p "$artifact_dir"
+case "$profile:$target:$action" in
+  native-amd64:native:build)
+    bash -n "$root"/src/tasks/*.sh "$root/tests/test_tasks.sh"
+    cc -std=c11 -Wall -Wextra -Werror -fsyntax-only "$root/src/fixtures/multicall_lab.c"
+    printf 'BUILD tasks=3 fixture=multicall_lab.c\n'
+    ;;
+  native-amd64:native:test|native-amd64:native:run)
+    exec env CARD_ROOT="$root" "$root/tests/test_tasks.sh" "$task"
+    ;;
+  native-amd64:native:debug)
+    trace_file="$artifact_dir/trace.log"
+    set +e
+    env CARD_ROOT="$root" bash -x "$root/tests/test_tasks.sh" "$task" >"$trace_file" 2>&1
+    status=$?
+    set -e
+    cat "$trace_file"
+    [[ $status -eq 0 && -s "$trace_file" ]]
+    printf 'TRACE %s log=%s\n' "$task" "$trace_file"
+    ;;
+  *) printf 'Unsupported profile/target/action: %s/%s/%s\n' "$profile" "$target" "$action" >&2; exit 2 ;;
+esac