diff --git a/CLAUDE.md b/CLAUDE.md
index 3e4c032..016294f 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -4,7 +4,7 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 
 ## Project Overview
 
-**Warfactory** is a Factorio-inspired industrial military simulation game combining factory management with strategic military doctrine. The project is currently in design/documentation phase with comprehensive technical specifications.
+**Warfactory** is a Factorio-inspired industrial military simulation game combining factory management with strategic military doctrine. The project has evolved from design/documentation phase to **functional implementation** with a complete 10-engine architecture and comprehensive build system.
 
 **Core Philosophy:**
 - Factory assembly lines as gameplay foundation
@@ -36,9 +36,10 @@ The project uses a modular documentation system in `/docs/`:
 ## Key Technical Concepts
 
 ### Engine Architecture
-- **Autonomous Engines**: 6 specialized engines (Economy, War, Intelligence, Designer, MacroEntity, Map)
+- **Autonomous Engines**: 10 specialized engines (Designer, Economy, Event, Factory, Intelligence, Logistic, MacroEntity, Map, Operation, War)
 - **Smart Client**: Request/response pattern, no streaming, FOW at chunk granularity
 - **Performance Target**: 60fps with 1000+ AI companies, 1-2 vehicle designs/tick globally
+- **Implementation Status**: All engines have functional stub implementations with threading and main loops
 
 ### Map System
 - **Multi-scale**: World (diplomatic) → Regional (logistics) → Local (factory) → Detail (combat)
@@ -60,8 +61,10 @@ Most initial "coherence problems" (P1-P30) were invalidated through clarificatio
 - Only P7 (engine responsibilities) requires further analysis
 
 ### Current Status
-- **Phase**: Design documentation complete, technically viable
-- **Next Steps**: Implementation planning, engine responsibility clarification
+- **Phase**: **Implementation active** - All 10 engines functional with CMake build system
+- **Build System**: Comprehensive CMake with defensive programming, sanitizers, and 16 C++ libraries
+- **Development Ready**: Fast/full build presets, optimized workflow for daily iteration
+- **Next Steps**: Engine logic expansion, inter-engine communication, gameplay features
 - **Questions Open**: 11 items in `questions-ouvertes.md` for future resolution
 
 ## Working with This Project
@@ -81,4 +84,67 @@ Most initial "coherence problems" (P1-P30) were invalidated through clarificatio
 - Start with `vue-ensemble.md` for project vision
 - Reference `architecture-technique.md` for technical decisions
 - Check `coherence-problem.md` for resolved design challenges
-- Use `questions-ouvertes.md` for known open issues
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+- Use `questions-ouvertes.md` for known open issues
+
+## Build System and Development
+
+### Build Commands
+```bash
+# Fast development build (minimal sanitizers, ~30s)
+cmake -DFAST_BUILD=ON .. && make claude-workflow-fast
+
+# Full validation build (all sanitizers + static analysis)
+cmake -DCMAKE_BUILD_TYPE=Debug .. && make
+
+# Release build (optimized, stack protection)
+cmake .. && make
+
+# Single engine development
+make economy-engine && ./bin/economy-engine
+```
+
+### Project Structure
+```
+├── engines/                    # 10 autonomous engines
+│   ├── Designer-Engine/        # Vehicle design with AI assistance
+│   ├── Economy-Engine/         # Market simulation, pricing
+│   ├── Event-Engine/           # Breakthrough system, global events
+│   ├── Factory-Engine/         # Factorio-like production
+│   ├── Intelligence-Engine/    # Metrics collection, reconnaissance
+│   ├── Logistic-Engine/        # Supply chains, transport
+│   ├── MacroEntity-Engine/     # Companies, diplomacy, administration
+│   ├── Map-Engine/             # Procedural generation, chunks, FOW
+│   ├── Operation-Engine/       # Military strategy, AI generals
+│   └── War-Engine/             # Combat simulation, frontlines
+├── cmake/                      # Build system configuration
+│   ├── WarfactoryDefenses.cmake    # Defensive programming
+│   ├── WarfactoryAutomation.cmake  # 16 C++ libraries
+│   └── WarfactoryAdvancedTools.cmake # Static analysis, testing
+├── build/                      # Build artifacts (git ignored)
+│   └── bin/                    # Final executables
+└── docs/                       # Complete design documentation
+```
+
+### Development Workflow
+1. **Fast iteration**: Use `FAST_BUILD=ON` for daily development
+2. **Single engine**: `make economy-engine` for focused work
+3. **Full validation**: Debug build with all sanitizers before commit
+4. **Engine-specific development**: Work directly in `engines/*/` directories
+5. **Incremental builds**: CMake rebuilds only modified files (~2-5s)
+
+### Dependencies and Libraries
+The project includes 16 C++ libraries via FetchContent:
+- **Networking**: zeromq, cppzmq, redis-plus-plus, cpprestsdk
+- **Logging**: spdlog, fmt
+- **Memory**: Microsoft GSL, foonathan/memory
+- **Testing**: Catch2, Google Test, Google Benchmark
+- **Utilities**: nlohmann/json, fifo_map, junction+turf, pcg-cpp
+- **Navigation**: recastnavigation, abseil-cpp
+- **Graphics**: imgui, sqlite
+
+### Defensive Programming Features
+- **Sanitizers**: AddressSanitizer, UndefinedBehaviorSanitizer, LeakSanitizer
+- **Static Analysis**: Clang Static Analyzer, Cppcheck, PVS-Studio integration
+- **Contract Programming**: GSL contracts, custom assertion macros
+- **Compiler Hardening**: Stack protection, frame pointers, maximum debug info
+- **Memory Safety**: Smart pointers, RAII patterns, leak detection
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