docs: Phase 100 P1 pinned receiver integration tests complete

- Update docs/development/current/main/phases/phase-100/README.md
  * Document P1 implementation and pinned receiver example
- Update docs/development/current/main/10-Now.md
  * Add Phase 100 P1 completion short report

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

docs/development/current/main/10-Now.md

@@ -1,5 +1,13 @@
 # Self Current Task — Now (main)
 
+## 2025-12-17：Phase 100 P1 完了 ✅
+
+**Phase 100 P1: Pinned Local Captures**
+- CapturedEnv に CapturedKind (Explicit/Pinned) 拡張
+- PinnedLocalAnalyzer で loop-outer read-only locals を識別
+- Pinned receiver (例: s.substring()) が loop 内で使用可能に
+- Fixture/smoke で動作確認済み
+
 ## 2025‑12‑17：Phase 99 完了 ✅
 
 **Phase 99: Trim/escape 実コード寄り強化（VM+LLVM EXE）**