[RELEASE] v3.19.19 - TDD Book 100% Validation + CI/CD Integration

Version bump to v3.19.19

Summary:
- 100% TDD Book validation: 27/27 modules, 151/151 tests passing
- CI/CD integration: stdlib validation in main workflow
- 4 critical bugs fixed: DEPYLER-0021, 0022, 0023 (+ regression), 0024
- Comprehensive README documentation update
- Production-ready for validated stdlib subset

Major Changes:
- Added tdd-book-stdlib-validation job to CI workflow
- Fixed struct module (pack/unpack/calcsize) - DEPYLER-0021
- Fixed memoryview/bytes literal generation - DEPYLER-0022
- Fixed Rust keyword collision - DEPYLER-0023
- Added graceful error handling for special keywords (self, Self, super, crate)
- Comprehensive stdlib support documentation in README

Quality Metrics:
- Tests: 151/151 TDD Book tests passing (100%)
- Core Tests: All passing, zero regressions
- Coverage: 27 stdlib modules validated
- CI/CD: Continuous regression protection enabled

See CHANGELOG.md for complete details.

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

Co-Authored-By: Claude <[email protected]>

Author: Claude

CHANGELOG.md

@@ -4,7 +4,65 @@ All notable changes to this project will be documented in this file.
 
 ## [Unreleased]
 
+## [3.19.19] - 2025-10-26
+
+### Summary
+**🎉 TDD Book 100% Validation + CI/CD Integration + Critical Bug Fixes**
+
+This release marks a major milestone with complete validation of 27 Python stdlib modules (151 tests passing) and integration of comprehensive CI/CD regression protection. Includes fixes for 4 critical transpiler bugs discovered during systematic validation.
+
+**Highlights:**
+- ✅ **100% TDD Book Validation**: 27/27 stdlib modules, 151/151 tests passing
+- 🔧 **CI/CD Integration**: Continuous regression protection for validated stdlib
+- 🐛 **4 Critical Bugs Fixed**: DEPYLER-0021, 0022, 0023 (+ regression), 0024
+- 📚 **Comprehensive Documentation**: README stdlib support matrix
+- 🎯 **Production Ready**: Validated stdlib subset safe for production use
+
 ### Added
+- **🔧 CI/CD INTEGRATION** (2025-10-26): TDD Book stdlib validation in main CI workflow
+  - **Feature**: Added `tdd-book-stdlib-validation` job to `.github/workflows/ci.yml`
+  - **Coverage**: Runs all 151 tests across 27 validated stdlib modules on EVERY PR/push
+  - **Protection**: BLOCKING quality gate - fails CI if any stdlib test fails
+  - **Modules Protected**: json, datetime, hashlib, textwrap, re, copy, memoryview, struct, math, itertools, string, functools, os, pathlib, io, collections, decimal, fractions, base64, csv, array, calendar, random, secrets, statistics, sys, time
+  - **Features**:
+    - Parallel execution with other CI jobs for performance
+    - Python/uv dependency caching for faster builds
+    - Comprehensive test output with module breakdown listing
+    - Coverage report generation and artifact upload
+    - GitHub Actions summary with validation results
+  - **Benefits**:
+    - Continuous regression protection for 27 validated stdlib modules
+    - Early detection of transpiler changes that break validated code
+    - Quality gate runs on all PR/push events (not path-filtered)
+    - Protects 100% TDD Book validation achievement
+  - **Documentation**: Added TDD Book and Stdlib Validation badges to README
+
+- **📚 TDD BOOK 100% VALIDATION** (2025-10-26): Complete stdlib module validation
+  - **Achievement**: All 27 stdlib modules validated, 151/151 tests passing (100% pass rate)
+  - **Bugs Discovered**: 4 critical bugs (all P0/P1 severity, all fixed)
+  - **Bug Discovery Rate**: Session 1: 50% (4 bugs in 8 modules), Session 2: 0% (0 bugs in 19 modules)
+  - **Quality Indicator**: Zero bugs in final 19 modules demonstrates exceptional transpiler maturity
+  - **Validated Modules by Category**:
+    - Data Serialization: json (6), struct (6), base64 (6), csv (6) - 24 tests
+    - Date/Time: datetime (6), calendar (5), time (5) - 16 tests
+    - Cryptography: hashlib (6), secrets (6) - 12 tests
+    - Text Processing: textwrap (6), re (6), string (6) - 18 tests
+    - Memory/Data: copy (6), memoryview (6), array (6) - 18 tests
+    - Math/Numeric: math (6), decimal (5), fractions (5), statistics (6) - 22 tests
+    - Functional: itertools (6), functools (4) - 10 tests
+    - File System: os (5), pathlib (6), io (5) - 16 tests
+    - Data Structures: collections (4) - 4 tests
+    - Random: random (5), secrets (6) - 11 tests
+    - System: sys (6) - 6 tests
+  - **Production Status**: Safe for production use with validated stdlib modules
+  - **Documentation**: See `tdd-book/VALIDATION-FINAL-2025-10-26.md` for complete analysis
+
+- **📝 DOCUMENTATION UPDATE** (2025-10-26): Comprehensive Python stdlib module support section
+  - **Added**: Python Stdlib Module Support section to README
+  - **Content**: All 27 validated modules organized by category with test counts
+  - **Links**: Links to TDD Book validation documentation
+  - **Badges**: Added stdlib validation badge (27 modules | 151 tests)
+
 - **🐛 SPYDECY DEBUGGER INTEGRATION** (2025-10-22): Interactive Python debugging
   - **Feature**: Integrated spydecy interactive debugger into depyler CLI
   - **Usage**: `depyler debug --spydecy script.py` for interactive debugging

Cargo.toml

@@ -19,7 +19,7 @@ max_cyclomatic_complexity = 15
 required_documentation_coverage = 100.0
 
 [workspace.package]
-version = "3.19.18"
+version = "3.19.19"
 edition = "2021"
 authors = ["Depyler Contributors"]
 license = "MIT OR Apache-2.0"