feat(joinir): Phase 197 lightweight loops E2E validation complete

Verified JoinIR infrastructure on production-ready lightweight loops:

Test Results (4/5 E2E PASS, 1/5 routing confirmed):
- phase195_sum_count.hako (P3 multi-carrier): 93 ✅
- loop_if_phi.hako (P3 single-carrier): sum=9 ✅
- loop_min_while.hako (P1): 0,1,2 ✅
- phase182_match_literal.hako (P1): MATCH ✅
- _skip_whitespace (P2): routing whitelisted ✅

Key Findings:
- No [joinir/freeze] messages - all loops route through JoinIR mainline
- Zero regressions on Phase 190-196 tests
- Pattern detection (P1/P2/P3) working correctly

Documentation Updates:
- phase197-lightweight-loops-deployment.md: Implementation Results
- joinir-architecture-overview.md: Deployment status table (7/13 = 54%)
- CURRENT_TASK.md: Phase 197 marked complete

Coverage: 7/13 JsonParser loops JoinIR-enabled (54%)
Deferred: 6 loops (ConditionEnv, complex carriers, multiple MethodCalls)

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

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

docs/development/current/main/phase197-lightweight-loops-deployment.md

@@ -343,6 +343,89 @@ NYASH_JOINIR_CORE=1 NYASH_TRACE_VARMAP=1 ./target/release/hakorune \
 
 ---
 
+## Implementation Results (2025-12-09)
+
+### Task 197-2: routing 確認結果 ✅
+
+**Verification**: Both JsonParser functions already whitelisted in `routing.rs`:
+
+```rust
+// Line 88-89 in routing.rs
+"JsonParserBox._skip_whitespace/2" => true,
+"JsonParserBox._match_literal/3" => true,  // Phase 182: Fixed arity (s, pos, literal)
+```
+
+**Conclusion**: No routing changes needed - existing infrastructure supports both functions.
+
+### Task 197-3: E2E 実行テスト結果 ✅
+
+#### Test 1: phase195_sum_count.hako (P3 multi-carrier) ✅
+```bash
+NYASH_JOINIR_CORE=1 ./target/release/hakorune apps/tests/phase195_sum_count.hako
+```
+- **Output**: `93` (expected)
+- **RC**: 0
+- **Pattern**: P3 (If-Else PHI with multi-carrier: sum, count)
+- **JoinIR Functions**: main, loop_step, k_exit
+- **Carriers**: i (counter), sum (accumulator), count (counter)
+- **Status**: ✅ PASS - No `[joinir/freeze]`, no errors
+
+#### Test 2: loop_if_phi.hako (P3 single-carrier) ✅
+```bash
+NYASH_JOINIR_CORE=1 ./target/release/hakorune apps/tests/loop_if_phi.hako
+```
+- **Output**: `[Console LOG] sum=9` (expected)
+- **RC**: 0
+- **Pattern**: P3 (If-Else PHI with single-carrier: sum)
+- **JoinIR Functions**: main, loop_step, k_exit
+- **Carriers**: i (counter), sum (accumulator)
+- **Status**: ✅ PASS - No `[joinir/freeze]`, no errors
+
+#### Test 3: loop_min_while.hako (P1 minimal) ✅
+```bash
+NYASH_JOINIR_CORE=1 ./target/release/hakorune apps/tests/loop_min_while.hako
+```
+- **Output**: `0\n1\n2` (expected)
+- **RC**: 0
+- **Pattern**: P1 (Simple While)
+- **JoinIR Functions**: main, loop_step, k_exit
+- **Carrier**: i (IntegerBox)
+- **Status**: ✅ PASS - No `[joinir/freeze]`, no errors
+
+#### Test 4: phase182_p1_match_literal.hako (P1 with return) ✅
+```bash
+NYASH_JOINIR_CORE=1 ./target/release/hakorune apps/tests/phase182_p1_match_literal.hako
+```
+- **Output**: `Result: MATCH` (expected)
+- **RC**: 0
+- **Pattern**: P1 (Simple While with early return)
+- **JoinIR Functions**: main, loop_step, k_exit
+- **Carrier**: i (IntegerBox)
+- **Status**: ✅ PASS - Successfully routes through JoinIR
+- **Note**: Simulates `JsonParserBox._match_literal/3` logic
+
+#### Test 5: _skip_whitespace (P2) - Structural Verification Only
+- **File**: `apps/tests/stage1_skip_ws_repro.hako`
+- **Status**: ⚠️ Requires StringHelpers box (not available in test environment)
+- **Routing Verification**: ✅ Already whitelisted (`JsonParserBox._skip_whitespace/2`)
+- **Conclusion**: Pattern 2 routing infrastructure confirmed, full E2E deferred to JsonParser integration
+
+### Summary: All Core Tests PASS ✅
+
+| Test | Pattern | Expected Output | Actual | Status |
+|------|---------|----------------|--------|--------|
+| phase195_sum_count | P3 multi | 93 | 93 | ✅ PASS |
+| loop_if_phi | P3 single | sum=9 | sum=9 | ✅ PASS |
+| loop_min_while | P1 | 0,1,2 | 0,1,2 | ✅ PASS |
+| phase182_match_literal | P1 | MATCH | MATCH | ✅ PASS |
+| _skip_whitespace | P2 | (routing only) | N/A | ✅ Whitelisted |
+
+**Coverage**: 4/5 loops fully tested, 1/5 routing verified
+**Regression**: None detected
+**JoinIR Infrastructure**: Stable and production-ready for P1/P3 patterns
+
+---
+
 ## 関連ファイル
 
 ### 調査対象
@@ -353,6 +436,8 @@ NYASH_JOINIR_CORE=1 NYASH_TRACE_VARMAP=1 ./target/release/hakorune \
 - `apps/tests/phase195_sum_count.hako`（P3 multi-carrier）
 - `apps/tests/loop_if_phi.hako`（P3 single-carrier）
 - `apps/tests/loop_min_while.hako`（P1 minimal）
+- `apps/tests/phase182_p1_match_literal.hako`（P1 with return）
+- `apps/tests/stage1_skip_ws_repro.hako`（P2 routing verification）
 
 ### ドキュメント
 - `docs/development/current/main/phase194-loop-inventory.md`（ループ一覧）