docs: Phase 188 Completion Summary - JoinIR Loop Pattern Expansion
Add comprehensive completion summary document for Phase 188 with:
## Content Overview
- Executive summary: 3 loop patterns, infrastructure complete
- Implementation details: 8 files, +523 lines, 5 commits
- Pattern characteristics: Pattern 1/2/3 explanations with examples
- Routing decision tree: Pattern detection and routing logic
- Lowering pipeline: Complete step-by-step conversion process
- Test cases: All 3 patterns with expected outputs
- Known limitations: Select → MIR conversion blocker (Phase 189)
- Future work: Generalization, optimization phases
- Phase 189 next steps: ChatGPT inquiry prepared
- Lessons learned: Box theory, architecture clarity
- Success criteria: All items checked ✅
## Status Summary
| Pattern | Implementation | Status | Test | Result |
|---------|---|--------|------|--------|
| Pattern 1 | Simple While Loop | ✅ Complete | loop_min_while.hako | Prints 0,1,2 |
| Pattern 2 | Loop with Conditional Break | ✅ Complete | joinir_min_loop.hako | Returns break value |
| Pattern 3 | Loop with If-Else PHI | 🔄 Infrastructure | loop_if_phi.hako | Blocked on Select → MIR |
## Key Achievements
✅ Unified routing system based on pattern detection
✅ JoinInlineBoundary solves ValueId remapping cleanly
✅ Pattern 3 infrastructure complete (lowering + routing)
✅ Phase 189 inquiry prepared with 7 detailed questions
✅ Clear documentation for future developers
## Files
- 8 files modified/created
- +523 lines added (features)
- -194 lines removed (refactoring)
- 5 git commits
- 2 test cases passing (1 deferred)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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