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>

docs/development/current/main/phases/phase-142-loopstmt/README.md

@@ -163,7 +163,14 @@ bash tools/smokes/v2/profiles/integration/apps/phase142_loop_stmt_only_then_retu
 
 **File**: `tools/smokes/v2/profiles/integration/apps/phase142_loop_stmt_only_then_return_length_min_llvm_exe.sh`
 
-**Status**: ⚠️ TODO in P1 (requires Phase 130 LLVM EXE gate complete)
+**Status**: ✅ P1 COMPLETE (LLVM EXE parity achieved)
+
+**Command**:
+```bash
+bash tools/smokes/v2/profiles/integration/apps/phase142_loop_stmt_only_then_return_length_min_llvm_exe.sh
+```
+
+**Result**: ✅ PASS (exit code 3, parity with VM)
 
 ---
 
@@ -305,13 +312,11 @@ bash tools/smokes/v2/profiles/integration/apps/phase142_loop_stmt_only_then_retu
 
 ## Next Steps
 
-### P1: LLVM EXE Smoke Test (TODO)
+### P1: LLVM EXE Smoke Test (DONE ✅)
 
-**File**: `tools/smokes/v2/profiles/integration/apps/phase142_loop_stmt_only_then_return_length_min_llvm_exe.sh`
-
-**Prerequisites**: Phase 130 LLVM EXE gate complete
-
-**Expected**: exit code 3 parity with VM
+- File: `tools/smokes/v2/profiles/integration/apps/phase142_loop_stmt_only_then_return_length_min_llvm_exe.sh`
+- Gate: `llvm_exe_preflight_or_skip` により、Phase 130 の LLVM EXE 前提が満たされない環境では SKIP を維持
+- Contract: exit code 3 parity with VM
 
 ### P2: Code Contract Enforcement (Planned)