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nyash-codex 3e82f2b670 docs(phase170-d): Phase 170-D-impl-4 Completion - Tests and Documentation

## Summary

Completed Phase 170-D-impl-4: Comprehensive documentation and test verification
for LoopConditionScopeBox infrastructure. All four implementation phases (1-4)
now complete with full modular Box-based architecture and thorough test coverage.

## Changes

### New Documentation
- **phase170-d-impl-design.md** (1,356 lines): Comprehensive design document
  - Architecture overview and modular components
  - Detailed implementation summary for all 4 phases
  - Test results and verification procedures
  - Architecture decisions (Box Theory, Fail-Fast, Conservative Classification)
  - Future work for Phase 170-D-E and Phase 171+

### Updated Documentation
- **CURRENT_TASK.md**: Added Phase 170-D completion section
  - Full status overview
  - Completed work breakdown
  - Test verification results
  - Commit history
  - Architecture summary

## Implementation Status

### Phase 170-D-impl Complete Summary

**Phase 170-D-impl-1** ✅
- LoopConditionScopeBox skeleton (220 lines)
- CondVarScope enum and data structures
- Public API design

**Phase 170-D-impl-2** ✅
- Minimal analysis logic (317 lines)
- Pure functions: extract_all_variables, is_outer_scope_variable
- 12 comprehensive unit tests

**Phase 170-D-impl-3** ✅
- Pattern 2/4 integration
- Fail-Fast validation checks
- 4 integration tests in loop_with_break_minimal.rs

**Phase 170-D-impl-4** ✅
- Design documentation
- Test verification and results
- Architecture guide

### Module Structure

```
src/mir/loop_pattern_detection/
├── mod.rs                    (201 lines)
├── loop_condition_scope.rs   (220 lines)
└── condition_var_analyzer.rs (317 lines)
Total: 738 lines
```

### Test Results

✅ Unit Tests: 16 total (12 in condition_var_analyzer + 4 in loop_with_break_minimal)
✅ Integration Tests: 2 verified (Pattern 2 accept/reject cases)
✅ Build: cargo build --release (0 errors, 50 warnings)
✅ Verification: NYASH_JOINIR_STRUCTURE_ONLY=1 tests pass

## Architecture Highlights

- **Box Theory**: Clear separation of LoopConditionScopeBox (orchestration) and
  condition_var_analyzer (pure functions)
- **Fail-Fast**: Early error detection before JoinIR generation
- **Conservative Classification**: Defaults to LoopBodyLocal for unknown variables
- **Reusable**: Pure functions independent and composition-friendly

## Future Work

Phase 170-D-E: Advanced Patterns (Pattern 5+)
- Support loop-body-local variables in conditions
- Expanded scope heuristics
- Selective pattern detection

Phase 171: Condition Environment Integration
- Tighter coupling with condition_to_joinir
- Enhanced variable mapping

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

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