Files
hakorune/src/mir/join_ir
nyash-codex 432fc96082 refactor(joinir): extract IfSumExitMetaBuilderBox for Fail-Fast carrier binding
Phase 118 refactoring: Box modularization for ExitMeta generation.

# Changes
- Created `exit_meta_builder.rs` with IfSumExitMetaBuilderBox
- Extracted ExitMeta generation logic from loop_with_if_phi_if_sum.rs
- Implemented Fail-Fast contract (carrier name validation)
- Added comprehensive unit tests (5 tests, all passing)

# Design
- **Responsibility**: Builds ExitMeta from carrier name + ValueId
- **Fail-Fast**: Validates carrier names immediately
- **Reusability**: Can be used by other patterns (Pattern 4, etc.)

# Test Results
- Unit tests: 5/5 PASS
- Phase 118 smoke tests: PASS (VM + LLVM)
- Phase 117 regression: PASS

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
2025-12-18 03:56:10 +09:00
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