docs(joinir): Phase 43/245B Normalized JoinIR completion summary

Complete documentation consolidation for Phases 26-45 Normalized JoinIR
infrastructure. All components are implemented and tested (937/937 PASS).

Key additions:
- PHASE_43_245B_NORMALIZED_COMPLETION.md: Master completion summary
  - Architecture components (Mode, Capability, Carriers, DigitPos, etc.)
  - Supported loop patterns (P1, P2 variants including JsonParser)
  - Complete file reference guide
  - Test coverage documentation
  - Future expansion roadmap

Updates:
- CURRENT_TASK.md: Moved Phase 43/245B to completed section
- joinir-architecture-overview.md: Phases 43-45 marked complete
- Historical docs: Added completion banners with links
  - phase223-loopbodylocal-condition-design.md
  - phase223-loopbodylocal-condition-inventory.md
  - PHASE_223_SUMMARY.md
  - phase245b-num_str-carrier-design.md
  - phase245c-function-param-capture-summary.md

Documentation hierarchy established:
- Master summary → individual design docs
- Historical docs → completion summary
- Cross-references complete across all docs

Status: Phase 43/245B Normalized infrastructure COMPLETE ✅

docs/development/current/main/phase223-loopbodylocal-condition-design.md

@@ -1,5 +1,9 @@
 # Phase 223-2: LoopBodyLocal Condition Promotion Design
 
+---
+**Phase 26-45 Completion**: このフェーズで設計した機能は Phase 43/245B で実装完了。最終状態は [PHASE_43_245B_NORMALIZED_COMPLETION.md](./PHASE_43_245B_NORMALIZED_COMPLETION.md) を参照。
+---
+
 ## Purpose
 
 This document defines the **API-level design** for promoting LoopBodyLocal variables used in loop conditions (header, break, continue) to bool carriers. This enables Pattern2/Pattern4 to handle loops like JsonParser's `_skip_whitespace` which currently Fail-Fast.