feat(L04): add RV32I decoder and register file card

tools/card-action.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+set -euo pipefail
+action="${1:?action is required}"
+root="${STEM_REPO:-$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")/.." && pwd)}"
+profile="${STEM_PROFILE:-native-amd64}"
+target="${STEM_TARGET:-native}"
+selector="${STEM_TASK:-task1}"
+state="${STEM_STATE_DIR:-$root/.stem/instances/local}"
+tasks=(task01_instruction_fields task02_opcode_decoder task03_register_file)
+resolve_task() {
+  local value="${1,,}" stem
+  for stem in "${tasks[@]}"; do [[ "$value" == "$stem" ]] && { printf '%s\n' "$stem"; return; }; done
+  [[ "$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/$task"
+mkdir -p "$state" "$artifact_dir"
+case "$profile:$target:$action" in
+  native-amd64:native:build) python3 -m py_compile "$root/tests/reference_model.py"; cp -f "$root/src/tasks/$task.sv" "$artifact_dir/" ;;
+  native-amd64:native:test|native-amd64:native:run) exec python3 "$root/tests/reference_model.py" "$task" ;;
+  hazard3-sim:hazard3-baremetal:build) exec "$root/tests/test_rtl.sh" --build-only "$task" ;;
+  hazard3-sim:hazard3-baremetal:test|hazard3-sim:hazard3-baremetal:run) exec "$root/tests/test_rtl.sh" "$task" ;;
+  hazard3-sim:hazard3-baremetal:debug) exec "$root/tests/test_rtl.sh" --trace "$task" ;;
+  *) printf 'Unsupported profile/target/action: %s/%s/%s\n' "$profile" "$target" "$action" >&2; exit 2 ;;
+esac