test: Phase 117 if-only nested-if call merge parity (VM + LLVM EXE)

Fixture & Smoke tests for nested if-only with call merge verification.

**Fixture**:
- apps/tests/phase117_if_only_nested_if_call_merge_min.hako
- Pattern: nested if (inner: b == 1) inside outer if (a == 1), outer else
- Call merge: f(1), f(2), f(3) results merged to single variable v
- Expected output: 2, 3, 4 (f(x) = x + 1)

**VM Smoke**:
- tools/smokes/v2/profiles/integration/apps/phase117_if_only_nested_if_call_merge_vm.sh
- Execution: NYASH_DISABLE_PLUGINS=1 HAKO_JOINIR_STRICT=1
- Validation: numeric output 3 lines "2\n3\n4"

**LLVM EXE Smoke**:
- tools/smokes/v2/profiles/integration/apps/phase117_if_only_nested_if_call_merge_llvm_exe.sh
- Required plugins: FileBox, MapBox, StringBox, ConsoleBox, IntegerBox
- Validation: numeric output "2\n3\n4" (3 lines)

**Verification**:
✅ VM smoke: PASS
✅ LLVM EXE smoke: PASS
✅ Regression (Phase 116): PASS

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

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

apps/tests/phase117_if_only_nested_if_call_merge_min.hako

@@ -0,0 +1,18 @@
+static box Main {
+    f(x) { return x + 1 }
+    g(a, b) {
+        local v = 0
+        if a == 1 {
+            if b == 1 { v = f(1) } else { v = f(2) }
+        } else {
+            v = f(3)
+        }
+        print(v)
+    }
+    main() {
+        g(1, 1)  // → 2 (f(1) = 1+1)
+        g(1, 0)  // → 3 (f(2) = 2+1)
+        g(0, 0)  // → 4 (f(3) = 3+1)
+        return "OK"
+    }
+}

tools/smokes/v2/profiles/integration/apps/phase117_if_only_nested_if_call_merge_llvm_exe.sh

@@ -0,0 +1,38 @@
+#!/bin/bash
+# Phase 117: if-only nested-if + 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|$INTEGERBOX_SO|nyash-integer-plugin"
+)
+LLVM_PLUGIN_BUILD_LOG="/tmp/phase117_if_only_nested_if_call_merge_plugin_build.log"
+llvm_exe_ensure_plugins_or_fail || exit 1
+
+INPUT_HAKO="$NYASH_ROOT/apps/tests/phase117_if_only_nested_if_call_merge_min.hako"
+OUTPUT_EXE="$NYASH_ROOT/tmp/phase117_if_only_nested_if_call_merge_llvm_exe"
+
+EXPECTED=$'2\n3\n4'
+EXPECTED_LINES=3
+LLVM_BUILD_LOG="/tmp/phase117_if_only_nested_if_call_merge_build.log"
+if llvm_exe_build_and_run_numeric_smoke; then
+  test_pass "phase117_if_only_nested_if_call_merge_llvm_exe: output matches expected (2\\n3\\n4)"
+else
+  exit 1
+fi

tools/smokes/v2/profiles/integration/apps/phase117_if_only_nested_if_call_merge_vm.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+source "$SCRIPT_DIR/../../../lib/output_validator.sh"
+
+FIXTURE="apps/tests/phase117_if_only_nested_if_call_merge_min.hako"
+
+echo "[phase117_if_only_nested_if_call_merge_vm] Testing nested if + call merge parity (VM)..."
+
+# VM execution with STRICT mode
+OUTPUT=$(NYASH_DISABLE_PLUGINS=1 HAKO_JOINIR_STRICT=1 ./target/release/hakorune --backend vm "$FIXTURE" 2>&1) || {
+    echo "❌ VM execution failed"
+    echo "$OUTPUT"
+    exit 1
+}
+
+# Validate: expect 3 lines with values 2, 3, 4
+validate_numeric_output 3 "2
+3
+4" "$OUTPUT"
+
+echo "✅ [phase117_if_only_nested_if_call_merge_vm] PASS"