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Rust concurrency design: workload classification, sharing models, and Send/Sync requirements. \n \n Guides decision-making between threads (CPU-bound), async (I/O-bound), and hybrid approaches before implementing \n Covers Send/Sync marker traits, thread-safety patterns (Arc, Mutex, RwLock, channels), and atomic operations with quick reference tables \n Includes mandatory \"trace up\" to domain skills (web, fintech, cloud-native, CLI) to align concurrency design with architectural constraints \n

Layer 1: Language Mechanics