# Session Summary: Book Sync Sprint Setup

**Date**: 2025-10-02
**Version**: v3.66.0
**Session Focus**: Book compatibility audit and sprint planning

## What Was Completed

### 1. Control Flow & WASM Completion (100%) ✅
- **Labeled Loops**: Implemented `'outer: for ...` with `break 'outer` and `continue 'outer`
- **Result Pattern Matching**: Implemented `Ok(x)` and `Err(x)` pattern matching
- **WASM Stack Analysis**: Verified WASM emitter already handles stack correctly
- **Test Results**: 44/44 control flow tests passing, 31/31 WASM tests passing

### 2. Book Sync Sprint Planning ✅
- **Chapter Audit**: Enumerated all 16 book chapters
- **Compatibility Matrix**: Created comprehensive analysis (BOOK_COMPATIBILITY_MATRIX.md)
- **Priority Analysis**: Identified 5 critical/medium priority chapters
- **Sprint Tickets**: Created 10 detailed implementation tickets

## Key Deliverables

### Documents Created
1. **BOOK_COMPATIBILITY_MATRIX.md** - Comprehensive chapter-by-chapter compatibility analysis
2. **SPRINT_3_PRIORITIES.md** - Detailed implementation roadmap with effort estimates
3. **roadmap.md updates** - Added Book Sync Sprint tickets (BOOK-CH18-001 through BOOK-CH23-AUDIT)

### Compatibility Findings
**Current Status** (v3.66.0):
- Overall: ~87%+ (estimated, up from 77% in v3.62.9)
- Chapter 5 (Control Flow): 100% ✅ (was 65%)
- Chapter 17 (Error Handling): 100% ✅ (was 45%)
- Chapter 18 (DataFrames): 0% ❌ (Critical)
- Chapter 15 (Binary Compilation): 25% ❌ (Critical)

### Priority Targets Identified
**P0 Critical** (Sprint 1):
1. Chapter 18 - DataFrames (0% → 75%+) - 4 examples to fix
2. Chapter 15 - Binary Compilation (25% → 75%+) - 3 examples to fix

**P1 Medium** (Sprint 2):
3. Chapter 4 - Practical Patterns (50% → 90%+) - 5 examples
4. Chapter 3 - Functions (82% → 100%) - 2 examples
5. Chapter 16 - Testing & QA (63% → 90%+) - 3 examples

**P2 Audit** (Sprint 3):
6. Chapter 19 - Structs & OOP (baseline unknown)
7. Chapter 22 - Compiler Development (baseline unknown)
8. Chapter 23 - REPL & Object Inspection (baseline unknown)

## Sprint Plan

### Sprint 1: Critical Features (P0)
**Target**: 77% → 82% (+5%)
**Effort**: 6-9 hours
**Tickets**: BOOK-CH18-001, BOOK-CH18-002, BOOK-CH15-001, BOOK-CH15-002

### Sprint 2: Core Features (P1)
**Target**: 82% → 89% (+7%)
**Effort**: 7-10 hours
**Tickets**: BOOK-CH04-001, BOOK-CH03-001, BOOK-CH16-001

### Sprint 3: New Chapter Baselines (P2)
**Target**: Establish baselines, aim for 90%+ overall
**Effort**: 3 hours
**Tickets**: BOOK-CH19-AUDIT, BOOK-CH22-AUDIT, BOOK-CH23-AUDIT

### Total Sprint Metrics
- **Estimated Total Effort**: 16-22 hours (2-3 sessions)
- **Estimated Total Impact**: +13-18 examples fixed
- **Success Rate Target**: 90%+ overall compatibility

## Recommended Next Action

**START HERE**: BOOK-CH18-001 (Chapter 18 DataFrame Audit)

**Rationale**:
- Highest impact: 0% → 75%+ (+3 examples)
- Critical advertised feature (data science users)
- Clear scope (4 examples only)
- Quick audit (1 hour estimated)

**First Command**:
```bash
cat ../ruchy-book/src/ch18-00-dataframes-data-processing.md
```

## Quality Gates

All sprint work must maintain:
- ✅ Zero regressions on 3415 existing tests
- ✅ All fixes TDD-first
- ✅ All functions <10 cyclomatic complexity
- ✅ PMAT A- grade maintained

## Files Modified

1. `/home/noah/src/ruchy/docs/execution/BOOK_COMPATIBILITY_MATRIX.md` - Created
2. `/home/noah/src/ruchy/docs/execution/SPRINT_3_PRIORITIES.md` - Updated
3. `/home/noah/src/ruchy/docs/execution/roadmap.md` - Updated with sprint tickets

## Success Criteria

- [ ] Phase 1 Complete: 82%+ compatibility
- [ ] Phase 2 Complete: 89%+ compatibility
- [ ] Phase 3 Complete: 90%+ baseline established
- [ ] All 10 tickets closed
- [ ] INTEGRATION.md updated with v3.66.0+ results
- [ ] Zero regressions verified
- [ ] Sprint retrospective documented
