Add mini FT controller#1451
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Adds the in-process mini fault-tolerance controller (mini_ft_controller.py: _MiniFTController / _MiniFTControllerRunner / maybe_start_mini_ft_controller) that periodically polls per-cell health snapshots and drives cell healing/restart decisions without an external operator. Includes its fast unit test. Wiring into the train entrypoints and the args validation are handled separately.
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Adds the in-process mini fault-tolerance controller (mini_ft_controller.py: _MiniFTController / _MiniFTControllerRunner / maybe_start_mini_ft_controller) that periodically polls per-cell health snapshots and drives cell healing/restart decisions without an external operator. Includes its fast unit test. Wiring into the train entrypoints and the args validation are handled separately.