New checkpoint saving strategy that keeps every k steps and additionally the n most recent checkpoints.#444

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BlueCrescent wants to merge 6 commits intomainfrom

checkpoint_strategy_with_ephemeral_inbetween_checkpoints

Commits on May 8, 2026

feat(checkpointing): New saving strategy that keeps every k steps and additionally the n most recent checkpoints.

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fix(checkpointing): Using global step count for checkpoint retention.

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test(checkpointing): Using global step count for checkpoint retention checks.
BlueCrescent
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docs(checkpointing): Improved description of KeepEveryKStepsAndMMostRecentCheckpointingStrategy.
BlueCrescent
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test(checkpointing): Test that KeepEveryKStepsAndMMostRecentCheckpointingStrategy does not delete any required checkpoints.

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test(checkpointing): Added num_seen_steps_previous_run to keep every k tests.

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