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Jihyeon Gim
d782e622fc
Wire C-side diagnostics (session reap, READY data phase outcome, init failures) through a sink callback so the gateway can surface them next to its own logs instead of losing them in stderr noise. The sink is a plain C function pointer installed once after init and valid until destroy: the Go side registers a fixed cgo trampoline (closures cannot cross the boundary), copies the message immediately per the lifetime contract, and never runs under the session map lock. Error-level lines keep the existing stderr output; --debug enables the level-2 diagnostic stream.