feat(normalization): Phase 142 P1 - LLVM EXE parity for loop normalization

Phase 142-loopstmt P1: LLVM EXE smoke test for statement-level loop normalization

- Added: tools/smokes/v2/profiles/integration/apps/phase142_loop_stmt_only_then_return_length_min_llvm_exe.sh
- Verification: Exit code 3 parity with VM test
- Status: ✅ PASS (exit code 3, string length computed correctly)

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

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

tools/smokes/v2/profiles/integration/apps/phase142_loop_stmt_only_then_return_length_min_llvm_exe.sh

@@ -0,0 +1,42 @@
+#!/bin/bash
+# Phase 142 P0: Loop normalization as single statement (LLVM EXE parity)
+#
+# Verifies that loop(true) normalization returns consumed=1, allowing
+# subsequent statements (return s.length()) to be processed normally.
+# Expected: exit code 3 (s="abc" → s.length() → 3)
+#
+# Dev-only: NYASH_JOINIR_DEV=1 HAKO_JOINIR_STRICT=1
+
+source "$(dirname "$0")/../../../lib/test_runner.sh"
+source "$(dirname "$0")/../../../lib/llvm_exe_runner.sh"
+export SMOKES_USE_PYVM=0
+require_env || exit 2
+
+# Preflight check (SKIP gate)
+llvm_exe_preflight_or_skip || exit 0
+
+# JoinIR dev mode (Phase 130+ gate)
+require_joinir_dev
+
+# Minimal plugins (String + Integer for s.length())
+STRINGBOX_SO="$NYASH_ROOT/plugins/nyash-string-plugin/libnyash_string_plugin.so"
+INTEGERBOX_SO="$NYASH_ROOT/plugins/nyash-integer-plugin/libnyash_integer_plugin.so"
+LLVM_REQUIRED_PLUGINS=(
+  "StringBox|$STRINGBOX_SO|nyash-string-plugin"
+  "IntegerBox|$INTEGERBOX_SO|nyash-integer-plugin"
+)
+LLVM_PLUGIN_BUILD_LOG="/tmp/phase142_loop_stmt_llvm_plugin_build.log"
+llvm_exe_ensure_plugins_or_fail || exit 1
+
+# Test configuration
+INPUT_HAKO="$NYASH_ROOT/apps/tests/phase142_loop_stmt_only_then_return_length_min.hako"
+OUTPUT_EXE="$NYASH_ROOT/tmp/phase142_loop_stmt_only_then_return_length_min_llvm_exe"
+
+# Execute (exit code contract)
+EXPECTED_EXIT_CODE=3
+LLVM_BUILD_LOG="/tmp/phase142_loop_stmt_llvm_build.log"
+if llvm_exe_build_and_run_expect_exit_code; then
+  test_pass "phase142_loop_stmt_llvm_exe: exit code matches (3)"
+else
+  exit 1
+fi