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81bf6d0b - fix: use signal.NotifyContext for container cleanup on SIGINT/SIGTERM (#2808)

fix: use signal.NotifyContext for container cleanup on SIGINT/SIGTERM (#2808) Replace manual goroutine-based signal handlers in predict and train commands with signal.NotifyContext. This ensures the context is cancelled on SIGINT/SIGTERM, causing in-flight operations to return and the deferred container cleanup to run reliably. Previously, the deferred predictor.Stop() would not execute when the process received a signal, leaving orphaned Docker containers running. Fixes #2799 Co-authored-by: Mark Phelps <209477+markphelps@users.noreply.github.com>