# Multi-Sprint Execution Plan
## All 4 Sprints - Extreme TDD - Do Not Stop

**Start Date**: 2025-10-02
**Target**: Complete all 4 sprints without stopping
**Methodology**: Extreme TDD (tests first, <10 complexity, ticket-based commits)

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## SPRINT 1: Error Handling (Chapter 17) - 45% → 90%

**Estimated Time**: 3-5 days (compressed to 1 session with extreme focus)
**Current Status**: 5/11 examples working
**Target**: 10/11 examples working

### Tickets:

**[ERROR-001]**: Verify current Chapter 17 status
- Run all Chapter 17 examples
- Identify which 6/11 are failing
- Document exact error messages
- Create regression test file
- **Complexity Target**: Analysis only
- **Tests**: 11 validation tests

**[ERROR-002]**: Fix basic error handling patterns
- Guard clauses working
- Safe defaults working
- Early returns working
- **Complexity Target**: <10 per function
- **Tests**: 5 TDD tests

**[ERROR-003]**: Input validation patterns
- Range validation
- Type validation
- Sanitization
- **Complexity Target**: <10 per function
- **Tests**: 5 TDD tests

**[ERROR-004]**: Error propagation
- Function composition with errors
- Error context preservation
- **Complexity Target**: <10 per function
- **Tests**: 5 TDD tests

**[ERROR-005]**: Verify all Chapter 17 examples pass
- Re-run all 11 examples
- Confirm 10/11 or 11/11 passing
- Update integration report
- **Tests**: 11 verification tests

**Expected Outcome**: Chapter 17 at 90%+, +5% book compatibility

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## SPRINT 2: Control Flow (Chapter 5) - 65% → 95%

**Estimated Time**: 2-4 days (compressed to 1 session)
**Current Status**: 11/17 examples working
**Target**: 16/17 examples working

### Tickets:

**[CONTROL-001]**: Verify current Chapter 5 status
- Run all Chapter 5 examples
- Identify which 6/17 are failing
- Document exact failures
- **Tests**: 17 validation tests

**[CONTROL-002]**: Implement `break` in loops
- `break` in for loops
- `break` in while loops
- **Complexity Target**: <10
- **Tests**: 5 TDD tests
- **Related**: Issue #26

**[CONTROL-003]**: Implement `continue` in loops
- `continue` in for loops
- `continue` in while loops
- **Complexity Target**: <10
- **Tests**: 5 TDD tests

**[CONTROL-004]**: Loop labels (if needed)
- `'outer: for ...`
- `break 'outer`
- `continue 'outer`
- **Complexity Target**: <10
- **Tests**: 3 TDD tests

**[CONTROL-005]**: Advanced pattern matching
- Exhaustiveness checking
- Multiple patterns
- **Complexity Target**: <10
- **Tests**: 5 TDD tests

**[CONTROL-006]**: Verify all Chapter 5 examples pass
- Re-run all 17 examples
- Confirm 16/17 or 17/17 passing
- **Tests**: 17 verification tests

**Expected Outcome**: Chapter 5 at 95%+, +4% book compatibility

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## SPRINT 3: Parser Hardening - Fix Edge Cases

**Estimated Time**: 2-3 days (compressed to 1 session)
**Current**: Various parser edge cases from GitHub issues
**Target**: Close 5+ parser issues

### Tickets:

**[PARSER-001]**: Audit all open parser GitHub issues
- List all parser-related issues
- Prioritize by severity
- Create test cases
- **Tests**: Issue reproduction tests

**[PARSER-002]**: Fix high-priority parser bugs
- Fix top 3 critical issues
- **Complexity Target**: <10
- **Tests**: 10 TDD tests

**[PARSER-003]**: Improve error messages
- Better suggestions for common mistakes
- Context in error messages
- **Complexity Target**: <10
- **Tests**: 5 TDD tests

**[PARSER-004]**: Parse recovery
- Recover from common syntax errors
- Provide helpful "did you mean" suggestions
- **Complexity Target**: <10
- **Tests**: 5 TDD tests

**[PARSER-005]**: Fuzzing and edge cases
- Run parser fuzzing
- Fix discovered crashes
- **Complexity Target**: <10
- **Tests**: Property tests

**Expected Outcome**: 5+ issues closed, more robust parser

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## SPRINT 4: Performance Optimization - 2-5x Improvement

**Estimated Time**: 5-8 days (compressed to 1 session focusing on wins)
**Current**: Baseline performance unknown
**Target**: 2-5x improvement on hot paths

### Tickets:

**[PERF-001]**: Establish baseline benchmarks
- Create benchmark suite
- Measure DataFrame operations
- Measure interpreter hot paths
- Measure recursive functions
- **Tests**: Benchmark suite

**[PERF-002]**: Profile hot paths
- Run profiler on benchmarks
- Generate flame graphs
- Identify top 5 bottlenecks
- **Tests**: Profiling data

**[PERF-003]**: Optimize interpreter eval loop
- Reduce Value cloning
- Inline hot functions
- **Complexity Target**: <10
- **Tests**: Benchmark verification

**[PERF-004]**: Optimize DataFrame operations
- Reduce allocations
- Use iterators instead of collections
- **Complexity Target**: <10
- **Tests**: DataFrame benchmarks

**[PERF-005]**: Optimize pattern matching
- Cache compiled patterns
- Reduce recursive calls
- **Complexity Target**: <10
- **Tests**: Pattern benchmarks

**[PERF-006]**: Verify performance gains
- Re-run all benchmarks
- Confirm 2x+ improvement
- Document wins
- **Tests**: Performance regression suite

**Expected Outcome**: 2-5x faster on hot paths, benchmark suite

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## Success Criteria (All 4 Sprints)

### Book Compatibility:
- Start: 80% (96/120 examples)
- Target: 89% (107/120 examples)
- Chapter 17: 45% → 90%
- Chapter 5: 65% → 95%

### Quality Metrics:
- All functions maintain <10 complexity
- All new code has TDD tests first
- 100+ new tests total
- Zero regressions on existing 3558+ tests
- PMAT quality gates passing

### Deliverables:
- 20+ tickets committed with ticket numbers
- Each ticket has dedicated commit
- Comprehensive test coverage
- Performance benchmark suite
- Updated documentation

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## Execution Protocol

### For Each Ticket:
1. **TDD First**: Write failing tests
2. **Implement**: Code to pass tests (<10 complexity)
3. **Verify**: All tests pass, no regressions
4. **Commit**: `git commit -m "[TICKET-ID] Description"`
5. **Push**: Push after each ticket (optional) or batch per sprint

### Quality Gates (Every Ticket):
- [ ] Tests written first (TDD)
- [ ] All tests passing
- [ ] Complexity <10 verified
- [ ] No clippy warnings
- [ ] PMAT quality gates passing
- [ ] Commit message has ticket ID

### Never Skip:
- Writing tests first
- Complexity verification
- Commit with ticket number
- Quality gate checks

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**READY TO START**: Sprint 1 - Error Handling
**First Ticket**: [ERROR-001] - Verify current Chapter 17 status
