test(joinir): Phase 128 - add fixture + smoke test (VM)

- Fixture: phase128_if_only_partial_assign_normalized_min.hako
  - Tests basic assign lowering with if/return pattern
  - Expected output: 2 (from then branch with print)
- Smoke: phase128_if_only_partial_assign_normalized_vm.sh
  - Validates output: 2 with exit code 0
  - Dev-only: NYASH_JOINIR_DEV=1 HAKO_JOINIR_STRICT=1
- Result: PASS

apps/tests/phase128_if_only_partial_assign_normalized_min.hako

@@ -1,7 +1,7 @@
 // Phase 128: if-only partial assign (else保持) - Normalized path test
 // NOTE: Phase 128 P3 simplified - full join_k continuation not yet implemented
 // This tests basic assign lowering only
-// Expected: x=1, flag=1, then assigns x=2, return should use latest x
+// Expected: x=1, flag=1, if condition true → return 2
 
 static box Main {
     main() {
@@ -10,8 +10,10 @@ static box Main {
         x = 1
         flag = 1
         if flag == 1 {
-            return 2
+            print(2)
+            return "OK"
         }
-        return 1
+        print(1)
+        return "OK"
     }
 }

tools/smokes/v2/profiles/integration/apps/phase128_if_only_partial_assign_normalized_vm.sh

@@ -0,0 +1,64 @@
+#!/bin/bash
+# Phase 128: If-only Partial Assign (Normalized, VM)
+#
+# Verifies that Assign(int literal) + If works in Normalized path:
+# - x=1; flag=1; if flag==1 { return 2 } return 1
+# - Assign statements update env
+# - Dev-only: NYASH_JOINIR_DEV=1 HAKO_JOINIR_STRICT=1
+#
+# Note: Full join_k continuation not yet implemented. This tests basic assign lowering.
+
+source "$(dirname "$0")/../../../lib/test_runner.sh"
+source "$(dirname "$0")/../../../lib/output_validator.sh"
+export SMOKES_USE_PYVM=0
+require_env || exit 2
+
+PASS_COUNT=0
+FAIL_COUNT=0
+RUN_TIMEOUT_SECS=${RUN_TIMEOUT_SECS:-10}
+
+echo "[INFO] Phase 128: If-only Partial Assign (Normalized, VM)"
+
+# Test 1: phase128_if_only_partial_assign_normalized_min.hako
+echo "[INFO] Test 1: phase128_if_only_partial_assign_normalized_min.hako"
+INPUT="$NYASH_ROOT/apps/tests/phase128_if_only_partial_assign_normalized_min.hako"
+
+set +e
+OUTPUT=$(timeout "$RUN_TIMEOUT_SECS" env \
+  NYASH_DISABLE_PLUGINS=1 \
+  HAKO_JOINIR_STRICT=1 \
+  NYASH_JOINIR_DEV=1 \
+  "$NYASH_BIN" --backend vm "$INPUT" 2>&1)
+EXIT_CODE=$?
+set -e
+
+if [ "$EXIT_CODE" -eq 124 ]; then
+  echo "[FAIL] hakorune timed out (>${RUN_TIMEOUT_SECS}s)"
+  FAIL_COUNT=$((FAIL_COUNT + 1))
+elif [ "$EXIT_CODE" -eq 0 ]; then
+  # Phase 128: exit code 0 is OK (return "OK")
+  EXPECTED="2"
+  if validate_numeric_output 1 "$EXPECTED" "$OUTPUT"; then
+    echo "[PASS] Output verified: 2 (exit code: $EXIT_CODE)"
+    PASS_COUNT=$((PASS_COUNT + 1))
+  else
+    echo "[INFO] output (tail):"
+    echo "$OUTPUT" | tail -n 50 || true
+    FAIL_COUNT=$((FAIL_COUNT + 1))
+  fi
+else
+  echo "[FAIL] hakorune failed with exit code $EXIT_CODE"
+  echo "[INFO] output (tail):"
+  echo "$OUTPUT" | tail -n 50 || true
+  FAIL_COUNT=$((FAIL_COUNT + 1))
+fi
+
+echo "[INFO] PASS: $PASS_COUNT, FAIL: $FAIL_COUNT"
+
+if [ "$FAIL_COUNT" -eq 0 ]; then
+  test_pass "phase128_if_only_partial_assign_normalized_vm: All tests passed"
+  exit 0
+else
+  test_fail "phase128_if_only_partial_assign_normalized_vm: $FAIL_COUNT test(s) failed"
+  exit 1
+fi