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/README.md

@@ -11,7 +11,7 @@
 - **Phase 141 P1.5（DONE）**: known intrinsic registry + available_inputs 3-source merge + diagnostics
 - **Phase 141 P2+（planned）**: Call/MethodCall 対応（effects + typing の段階投入）
 - **Phase 142-loopstmt P0（DONE）**: 正規化単位を statement（loop 1個）へ寄せる（パターン爆発を止める）
-- **Phase 142-loopstmt P1（planned）**: LLVM EXE smoke（同 fixture）を追加
+- **Phase 142-loopstmt P1（DONE）**: LLVM EXE smoke（同 fixture）を追加
 - **Phase 143-loopvocab（planned）**: StepTree の語彙拡張（loop 内 if/break/continue を「語彙追加」で吸収）
 - **Phase 91–92**: Selfhost depth‑2 coverage（P5b escape recognition → lowering）
 - **Phase 94–100**: P5b escape E2E / Trim policy / pinned + accumulator（VM/LLVM EXE parity）