Summary

Create a comprehensive cross-system integration guide documenting how the 7 kcenon ecosystem systems work together, with dependency maps, initialization sequences, and integration patterns.

Parent Issue

Part of: [EPIC] docs: Address documentation gaps across all ecosystem systems (#325)

Background (Why)

The kcenon ecosystem consists of 7 C++ systems plus Rust ports, but there is no documentation explaining how to integrate multiple systems together. Each system's docs exist in isolation. A developer wanting to build an application using multiple systems (e.g., network + database + logging + monitoring) has no guide for:

• Initialization order and dependency resolution
• Service container setup with multiple systems
• Adapter wiring between systems
• Shared configuration management

Scope (What)

Create docs/INTEGRATION_GUIDE.md covering:

1. Ecosystem Dependency Map

common_system (Tier 0 - Foundation)
    ├── thread_system (Tier 1)
    │   ├── logger_system (Tier 2)
    │   │   └── database_system (Tier 3)
    │   └── monitoring_system (Tier 2, Rust)
    ├── container_system (Tier 1)
    └── network_system (Tier 2)

2. Integration Patterns

Using unified_bootstrapper

auto system = unified_bootstrapper::create()
    .add<thread_system>()
    .add<logger_system>()
    .add<database_system>()
    .add<network_system>()
    .configure(config)
    .bootstrap();

Manual Adapter Wiring

• typed_adapter for cross-system connections
• Service container registration
• Lifecycle management

3. Common Integration Scenarios

4. Configuration Across Systems

• Unified config with per-system sections
• Shared settings (thread pool sizes, log levels)
• System-specific overrides

5. Error Handling Across Systems

• Error code ranges by system
• Cross-system error propagation
• Result composition patterns

6. Initialization and Shutdown

• Bootstrap order (respecting dependencies)
• Graceful shutdown sequence (reverse order)
• Timeout handling during shutdown
• Resource cleanup guarantees

7. Complete Example Application

• Full 100-line example using 4+ systems together
• Build system (CMakeLists.txt) setup for multi-system

Acceptance Criteria

• Dependency map with all 7 systems documented
• Bootstrapper usage guide
• At least 4 integration scenario examples
• Error handling across systems explained
• Initialization/shutdown sequence documented
• Complete example application with build setup
• Korean translation created