Summary

Create the final part of the cross-system integration guide, covering error handling across systems, initialization/shutdown sequences, and a complete working example.

Parent Issue

Part of: #329

Dependencies

Blocked by: #334 (Part 1)
Blocked by: TBD (Part 2 issue number)

Scope (What)

Complete docs/INTEGRATION_GUIDE.md with the following sections:

5. Error Handling Across Systems

Document cross-system error management:

• Error code ranges by system
  • common_system: 1000-1999
  • thread_system: 2000-2999
  • logger_system: 3000-3999
  • database_system: 4000-4999
  • network_system: 5000-5999
  • container_system: 6000-6999
  • monitoring_system: 7000-7999
• Cross-system error propagation patterns
• Result composition for multi-system operations
• Error context preservation across system boundaries

6. Initialization and Shutdown

Document complete lifecycle management:

• Bootstrap initialization order (respecting tier dependencies)
• Parallel initialization within same tier
• Graceful shutdown sequence (reverse dependency order)
• Timeout handling during shutdown
• Resource cleanup guarantees
• Error recovery during initialization

Example shutdown sequence:

1. database_system.shutdown(timeout: 5s)
2. parallel { logger_system.shutdown(), network_system.shutdown() }
3. parallel { thread_system.shutdown(), container_system.shutdown() }
4. common_system.shutdown()

7. Complete Example Application

Provide a full working example (100-line):

• Uses 4+ systems together
• Demonstrates all integration patterns
• Includes error handling
• Shows proper initialization/shutdown
• Includes CMakeLists.txt for multi-system build

Example structure:

// main.cpp - Multi-system application
#include <common_system/...>
#include <thread_system/...>
#include <logger_system/...>
#include <database_system/...>

int main() {
    // Bootstrap with error handling
    auto result = unified_bootstrapper::create()
        .add<thread_system>()
        .add<logger_system>()
        .add<database_system>()
        .bootstrap();
    
    if (!result) {
        // Handle initialization failure
        return 1;
    }
    
    // Application logic
    
    // Graceful shutdown
    return 0;
}

Acceptance Criteria

• Error code ranges for all 7 systems documented
• Error propagation patterns explained with examples
• Initialization/shutdown sequence fully documented
• Timeout and error recovery strategies explained
• Complete 100-line example application provided
• CMakeLists.txt for multi-system build included
• Example builds and runs successfully
• Korean translation of the complete guide created

Deliverables

• docs/INTEGRATION_GUIDE.md (Sections 5-7)
• examples/multi_system_app/main.cpp
• examples/multi_system_app/CMakeLists.txt
• Korean translation: docs/ko/INTEGRATION_GUIDE.md