fix(joinir): Phase 241-EX - Remove hardcoded 'sum' check from Pattern3

Remove legacy hardcoded 'sum' carrier validation that was blocking
array_filter patterns with different accumulator names (e.g., 'out').

Before: Pattern3 required carrier named 'sum' to exist
After: Pattern3 uses carrier_info generically (any carrier name works)

Test results:
- phase49_joinir_array_filter_smoke: PASS ✅
- phase49_joinir_array_filter_fallback: PASS ✅
- phase49_joinir_array_filter_ab_comparison: PASS ✅
- Full suite: 909/909 PASS, 0 FAIL

Also: Archive old roadmap documentation (67k lines moved to docs/archive/)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

docs/development/proposals/comprehensive-refactoring-discovery-2025-12-05.md

@@ -1,5 +1,8 @@
 # Comprehensive Rust Code Refactoring Discovery
 
+Status: Active  
+Scope: Rust コード全体のリファクタリング候補を洗い出した調査結果の現行まとめ（2025-12-05 時点）。
+
 **Date**: 2025-12-05
 **Scope**: Entire `/home/tomoaki/git/hakorune-selfhost/src` directory
 **Methodology**: Line count + complexity analysis + activity analysis + Phase 188 context