Summary

Consolidate commonly duplicated infrastructure components across the ecosystem into common_system, following Kent Beck's Simple Design principles (No Duplication, Fewest Elements).

Background (Why)

Kent Beck's Principles Violations

Current Problems

1. circuit_breaker duplication: Exists in thread_system, monitoring_system, and network_system
2. Result pattern duplication: Each system may have its own error handling
3. Stats interface fragmentation: No common interface for statistics collection
4. Incomplete bootstrapper: register_core_services() and register_optional_services() are empty

Scope (What)

Components to Consolidate

common_system/include/kcenon/common/
├── resilience/
│   ├── circuit_breaker.h        # Moved from thread/monitoring/network
│   ├── retry_policy.h           # Common retry logic
│   └── error_boundary.h         # Common error handling
├── patterns/
│   └── stats_interface.h        # IStats common interface
└── di/
    └── unified_bootstrapper.h   # Complete implementation

Migration Strategy

1. Extract common interface from existing implementations
2. Implement in common_system with configuration options
3. Update dependent systems to use common_system version
4. Deprecate and remove duplicates

Child Issues

• [Task] Extract common circuit_breaker to common_system
• [Task] Create IStats common interface for statistics
• [Task] Implement register_core_services() in unified_bootstrapper
• [Task] Implement register_optional_services() in unified_bootstrapper
• [Task] Complete IServiceScope implementation for scoped DI
• [Task] Simplify result.h header structure

Acceptance Criteria

• Single circuit_breaker implementation in common_system
• Common IStats interface adopted by all systems
• unified_bootstrapper fully functional
• Scoped service resolution works correctly
• All dependent system tests pass after migration
• No duplicate circuit_breaker in thread/monitoring/network systems