Go Development (1.25+) Core Principles - Stdlib first : External deps only when justified - Concrete types : Define interfaces at consumer, return structs - Composition : Over inheritance, always - Fail fast : Clear errors with context - Simple : The obvious solution is usually correct Quick Patterns Error Handling Struct with Options Table-Driven Tests Go 1.25 Features - testing/synctest : Deterministic concurrent testing with simulated clock - encoding/json/v2 : Experimental, 3-10x faster (GOEXPERIMENT=jsonv2) - runtime/trace.FlightRecorder : Production trace capture on-demand - Container-a…