test: Phase 116 if-only keep+call merge parity (VM + LLVM EXE)

Phase 116 固定: if-only で片側が元値保持、片側が call 結果の merge パターン

## 実装内容

### Fixture
- `apps/tests/phase116_if_only_keep_plus_call_min.hako`
- Expected output: `10\n2`
- Pattern:
  - then側: call結果でvを更新 (`v = f(1)`)
  - else側: 元の値を保持 (`v = 10`)
  - merge地点: 異なるソース（元値 vs call結果）からのPHI

### Smoke Tests
- `phase116_if_only_keep_plus_call_vm.sh` - VM parity
  - output_validator.sh で数値2行 `10\n2` を検証
  - `NYASH_DISABLE_PLUGINS=1 HAKO_JOINIR_STRICT=1`
- `phase116_if_only_keep_plus_call_llvm_exe.sh` - LLVM EXE parity
  - llvm_exe_runner.sh を利用（plugin dlopen/cache/build-all SSOT）
  - llvm_exe_build_and_run_numeric_smoke で検証

## 検証結果

✅ VM smoke: PASS (10\n2)
✅ LLVM EXE smoke: PASS (10\n2)
✅ 回帰 (Phase 115): PASS (2\n3)

## 技術的詳細

### JoinIR Pattern 1 (Simple If)

```
entry_block:
  v = 10
  if flag == 1 goto then_block else exit_block

then_block:
  v = f(1)
  goto exit_block

exit_block:
  v_merged = PHI [v=10 from entry, v=f(1) from then]
  print(v_merged)
```

### PHI接続の重要性
- entry → exit: 元値 (`10`) を直接伝播
- then → exit: call結果 (`f(1)`) を伝播
- PHI: 異なる型のソース（変数 vs call結果）を正しくmerge

LLVM IRでは、これらが適切な型で統一される必要がある。

## Box-First原則の適用

✅ 既存の箱化されたコンポーネントを活用
  - output_validator.sh による出力検証の統一
  - llvm_exe_runner.sh によるLLVM実行の標準化
  - テストインフラの再利用（no reinvention）

## Fail-Fast原則

✅ VM/LLVM両方でエラーを即座に検出
  - `HAKO_JOINIR_STRICT=1` で厳密な検証
  - フォールバック処理なし（エラーは明示的に失敗）

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/tests/phase116_if_only_keep_plus_call_min.hako

@@ -0,0 +1,23 @@
+// Phase 116: if-only keep+call merge parity
+// Test one side keeps original value, other side calls function
+
+static box Main {
+  f(x) {
+    return x + 1
+  }
+
+  g(flag) {
+    local v
+    v = 10
+    if flag == 1 {
+      v = me.f(1)
+    }
+    print(v)
+  }
+
+  main() {
+    me.g(0)
+    me.g(1)
+    return "OK"
+  }
+}

tools/smokes/v2/profiles/integration/apps/phase116_if_only_keep_plus_call_llvm_exe.sh

@@ -0,0 +1,38 @@
+#!/bin/bash
+# Phase 116: if-only keep+call merge parity (LLVM EXE)
+
+source "$(dirname "$0")/../../../lib/test_runner.sh"
+source "$(dirname "$0")/../../../lib/llvm_exe_runner.sh"
+export SMOKES_USE_PYVM=0
+require_env || exit 2
+
+llvm_exe_preflight_or_skip || exit 0
+
+# Phase 97/98/100 SSOT: plugin dlopen check → build only if needed → dlopen recheck.
+FILEBOX_SO="$NYASH_ROOT/plugins/nyash-filebox-plugin/libnyash_filebox_plugin.so"
+MAPBOX_SO="$NYASH_ROOT/plugins/nyash-map-plugin/libnyash_map_plugin.so"
+STRINGBOX_SO="$NYASH_ROOT/plugins/nyash-string-plugin/libnyash_string_plugin.so"
+CONSOLEBOX_SO="$NYASH_ROOT/plugins/nyash-console-plugin/libnyash_console_plugin.so"
+INTEGERBOX_SO="$NYASH_ROOT/plugins/nyash-integer-plugin/libnyash_integer_plugin.so"
+
+LLVM_REQUIRED_PLUGINS=(
+  "FileBox|$FILEBOX_SO|nyash-filebox-plugin"
+  "MapBox|$MAPBOX_SO|nyash-map-plugin"
+  "StringBox|$STRINGBOX_SO|nyash-string-plugin"
+  "ConsoleBox|$CONSOLEBOX_SO|nyash-console-plugin"
+  "IntegerBox|$INTEGERBOX_SO|nyash-integer-plugin"
+)
+LLVM_PLUGIN_BUILD_LOG="/tmp/phase116_if_only_keep_plus_call_plugin_build.log"
+llvm_exe_ensure_plugins_or_fail || exit 1
+
+INPUT_HAKO="$NYASH_ROOT/apps/tests/phase116_if_only_keep_plus_call_min.hako"
+OUTPUT_EXE="$NYASH_ROOT/tmp/phase116_if_only_keep_plus_call_llvm_exe"
+
+EXPECTED=$'10\n2'
+EXPECTED_LINES=2
+LLVM_BUILD_LOG="/tmp/phase116_if_only_keep_plus_call_build.log"
+if llvm_exe_build_and_run_numeric_smoke; then
+  test_pass "phase116_if_only_keep_plus_call_llvm_exe: output matches expected (10\\n2)"
+else
+  exit 1
+fi

tools/smokes/v2/profiles/integration/apps/phase116_if_only_keep_plus_call_vm.sh

@@ -0,0 +1,55 @@
+#!/bin/bash
+# Phase 116: if-only keep+call merge parity (VM)
+#
+# Verifies that if-only with one side keeping original value and other side calling works correctly.
+
+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}
+
+INPUT="$NYASH_ROOT/apps/tests/phase116_if_only_keep_plus_call_min.hako"
+
+echo "[INFO] Phase 116: if-only keep+call merge parity (VM) - $INPUT"
+
+set +e
+OUTPUT=$(timeout "$RUN_TIMEOUT_SECS" env \
+  NYASH_DISABLE_PLUGINS=1 \
+  HAKO_JOINIR_STRICT=1 \
+  "$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
+  EXPECTED=$'10\n2'
+  if validate_numeric_output 2 "$EXPECTED" "$OUTPUT"; then
+    echo "[PASS] Output verified: 10\\n2"
+    PASS_COUNT=$((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 "phase116_if_only_keep_plus_call_vm: All tests passed"
+  exit 0
+else
+  test_fail "phase116_if_only_keep_plus_call_vm: $FAIL_COUNT test(s) failed"
+  exit 1
+fi