Go Worker (internal/worker/native_bridge_libs.go):
- Add global hashCtx with sync.Once for lazy initialization
- Eliminates 5-20ms fh_init/fh_cleanup per hash operation
- Uses runtime.NumCPU() for optimal thread count
- Log initialization time for observability
Zig CLI (cli/src/native/hash.zig):
- Add global_ctx with atomic flag and mutex
- Thread-safe initialization with double-check pattern
- Idempotent init() callable from multiple threads
- Log init time for debugging
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