explain: use checkpoint.Writer directly instead of a local duplicate interface
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Addresses Copilot review on #1481: checkpointSummaryUpdater had the exact signature of the new checkpoint.Writer, so the local interface was redundant and risked drifting from the canonical write surface.
Co-Authored-By: Claude Opus 4.8 (1M context) noreply@anthropic.com Entire-Checkpoint: fd7281b01ac1
Checkpoints
can you look at this branch / pr also in the context of https://github.com/entireio/cli/issues/1433 and especially https://github.com/entireio/cli/issues/1433#issuecomment-4722283362
Claude CodeOpus 4.8[1m]
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