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bffdf0809f
Add a durable raw enumeration cursor shape to scanner usage metadata and validate it against bucket identity, source, bounds, version, and page digest before preserving it across checkpoint preparation. Keep empty cursor metadata omitted so existing pinned .usage-cache.bin bytes stay unchanged, while legacy readers still ignore the additive field when it is present. Co-authored-by: zhi22915 <qiuzgang@gmail.com>