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3af6512514
createSessionWithTimeout checked sys.client for nil and then dereferenced it again inside the goroutine that calls NewSession. update() runs the SMART fetch in its own goroutine, so closeSSHConnection can clear the field between those two reads and the goroutine dereferences a nil client, panicking the whole hub process. Make client an atomic.Pointer, load it once before starting the goroutine, and clear it with Swap so a concurrent close cannot be observed mid-session-creation. NewSession on an already-closed client returns an error, which the existing retry path already handles. Closes #2157