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c3a432101b
The per-system updater reused an SSH client across ticks and ran the data exchange with no deadline. If a connection went half-open (dead peer that never sends RST/FIN) or an agent accepted the session but never wrote a response, the read in fetchDataViaSSH blocked forever. Because StartUpdater calls update() synchronously on its ticker, a blocked read froze the whole per-system goroutine: the ticker's subsequent ticks were dropped, no error was returned so the system stayed "up", and the agent was never re-dialed until the hub process restarted. Bound each SSH data exchange with sshOperationTimeout via runWithTimeout: on timeout the connection is torn down (unwinding the blocked read) and a retryable error is returned, so the next tick re-dials. Also enable TCP keep-alive on dialed connections as a backstop for genuine network death. Fixes #2041