refactor(llvm): Phase 132-P1 follow-up - bind block_end_values and clear predeclared PHIs

docs/development/current/main/phase131-3-llvm-lowering-inventory.md

@@ -27,6 +27,16 @@
   - Investigation: [phase132-llvm-exit-phi-wrong-result.md](investigations/phase132-llvm-exit-phi-wrong-result.md)
   - Phase summary: [phases/phase-132/README.md](phases/phase-132/README.md)
 
+## Phase 132-P1 Update (2025-12-15)
+
+✅ **STRUCTURAL FIX**: Function-local state isolation in LLVM Python backend
+
+- **Issue**: block id / value id が “関数をまたいで” 衝突し得る（snapshot / cache / PHI state の漏洩）
+- **Fix**: `FunctionLowerContext` Box で function-scoped state を隔離し、tuple-key workaround を不要化
+- **Code**:
+  - `src/llvm_py/context/function_lower_context.py`
+  - `src/llvm_py/builders/function_lower.py`
+
 ## Root Causes Identified
 
 ### 1. TAG-EMIT: Loop PHI → Invalid LLVM IR (Case B) ✅ FIXED (Phase 131-10)