# Sprint 3: Book Sync - Implementation Priorities

**Sprint Goal**: Systematic book compatibility improvements (77% → 90%+)
**Start Date**: 2025-10-02
**Version**: v3.66.0

## Setup Complete ✅

1. ✅ **Chapter Enumeration**: 16 chapters identified
2. ✅ **Compatibility Matrix**: Created BOOK_COMPATIBILITY_MATRIX.md
3. ✅ **Priority Analysis**: 5 critical/medium priority chapters identified
4. ✅ **Sprint Tickets**: 10 tickets created in roadmap.md
5. ✅ **Baseline Updated**: v3.66.0 improvements documented (Ch5: 100%, Ch17: 100%)

## Implementation Order (Highest ROI First)

### Phase 1: Critical Features (P0) 🚨
**Target**: 77% → 82% (+5%)

#### Ticket BOOK-CH18-001: Chapter 18 DataFrame Audit
**Current**: 0/4 examples (0%)
**Target**: 3/4+ examples (75%+)
**Impact**: +3 examples (+2.5%)

**Action Items**:
1. Read `../ruchy-book/src/ch18-00-dataframes-data-processing.md`
2. Extract all 4 code examples
3. Test each with current interpreter
4. Document exact failure modes
5. Identify missing features (df! macro, methods)

**Estimated Effort**: 1 hour (audit + testing)

#### Ticket BOOK-CH18-002: DataFrame Implementation
**Dependencies**: BOOK-CH18-001 complete
**Target**: All 4 examples passing

**Likely Fixes**:
- df! macro parsing (if broken)
- Missing methods (.select, .groupby, .join)
- Edge cases in existing methods

**Estimated Effort**: 2-4 hours (implementation + tests)

#### Ticket BOOK-CH15-001: Chapter 15 Binary Compilation Audit
**Current**: 1/4 examples (25%)
**Target**: 3/4+ examples (75%+)
**Impact**: +2 examples (+1.7%)

**Action Items**:
1. Read `../ruchy-book/src/ch15-00-binary-compilation-deployment.md`
2. Extract failing examples (3 expected)
3. Test `ruchy compile` command
4. Document compilation/deployment issues

**Estimated Effort**: 1 hour

#### Ticket BOOK-CH15-002: Binary Compilation Fixes
**Dependencies**: BOOK-CH15-001 complete
**Target**: 3/4 examples working

**Likely Fixes**:
- `ruchy compile` command issues
- Deployment workflow problems
- Binary execution edge cases

**Estimated Effort**: 2-3 hours

**Phase 1 Total Effort**: 6-9 hours
**Phase 1 Impact**: +5 examples (+4.2%)

---

### Phase 2: Core Features (P1) 🔧
**Target**: 82% → 89% (+7%)

#### Ticket BOOK-CH04-001: Chapter 4 Practical Patterns
**Current**: 5/10 examples (50%)
**Target**: 9/10+ examples (90%+)
**Impact**: +4 examples (+3.3%)

**Estimated Effort**: 3-4 hours

#### Ticket BOOK-CH03-001: Chapter 3 Functions
**Current**: 9/11 examples (82%)
**Target**: 11/11 examples (100%)
**Impact**: +2 examples (+1.7%)

**Estimated Effort**: 2-3 hours

#### Ticket BOOK-CH16-001: Chapter 16 Testing & QA
**Current**: 5/8 examples (63%)
**Target**: 7/8+ examples (90%+)
**Impact**: +2 examples (+1.7%)

**Estimated Effort**: 2-3 hours

**Phase 2 Total Effort**: 7-10 hours
**Phase 2 Impact**: +8 examples (+6.7%)

---

### Phase 3: New Chapter Baselines (P2) 🔍
**Target**: Establish baselines, aim for 90%+ overall

#### Ticket BOOK-CH19-AUDIT: Structs & OOP
**Current**: Unknown (not in v3.62.9 report)
**Action**: Extract examples, test, establish baseline

**Estimated Effort**: 1 hour

#### Ticket BOOK-CH22-AUDIT: Compiler Development
**Current**: Unknown
**Action**: Extract examples, test, establish baseline

**Estimated Effort**: 1 hour

#### Ticket BOOK-CH23-AUDIT: REPL & Object Inspection
**Current**: Unknown
**Action**: Extract examples, test, establish baseline

**Estimated Effort**: 1 hour

**Phase 3 Total Effort**: 3 hours
**Phase 3 Impact**: Establish baseline (estimate +5-10 examples)

---

## Total Sprint Metrics

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

**Quality Gates**:
- ✅ Zero regressions on 3415 existing tests
- ✅ All fixes TDD-first
- ✅ All functions <10 cyclomatic complexity
- ✅ PMAT A- grade maintained

## Recommended Next Action

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

**Why**:
- Highest impact (0% → 75%+ = +3 examples)
- Critical advertised feature
- Clear scope (4 examples only)
- Quick audit (1 hour)

**Command to Start**:
```bash
# Read chapter and extract examples
cat ../ruchy-book/src/ch18-00-dataframes-data-processing.md

# Or use extraction script if available
make extract-book-examples CHAPTER=18
```

## Success Checklist

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