- Add lock-free ResultCollector for parallel execution with atomic operations, eliminating mutex contention for pre-allocated slices
- Implement circuit breaker pattern (internal/retry/circuit_breaker) with configurable thresholds and half-open recovery state for fault tolerance
- Introduce json-iterator replacement (internal/json) for 2-6x faster JSON operations while maintaining stdlib compatibility
- Add lazy template rendering (RenderLazy) with variable reference caching for 50-80% faster rendering on large contexts
- Implement memory-efficient buffer pooling (bufpool) with 10MB pre-allocated reusable buffers for reduced GC pressure
- Add LoadFlowWithModules for parallel module pre-loading using errgroup, improving startup time for complex flows
- Add VarRefCache with LRU eviction for variable extraction caching
- Add streaming output support for foreach loops to process large datasets without memory accumulation
- Fix json import compatibility in llm_executor and db_functions
- Update test fixtures with correct YAML field names (call→function, run→command)
j3ssie