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* fix(scanner): bound old-cache lookups and recover checkpoint saves Keep missing child lookups read-only and preserve the checkpoint receiver after ordinary persistence errors. Reload on stale CAS or indeterminate revision refresh, and report confirmed periodic saves separately. Co-Authored-By: heihutu <heihutu@gmail.com> Co-Authored-By: zhi22915 <qiuzgang@gmail.com> * fix(scanner): remove redundant checkpoint error conversion Return the existing StorageError directly so strict Clippy passes. Co-Authored-By: heihutu <heihutu@gmail.com> Co-Authored-By: zhi22915 <qiuzgang@gmail.com> * docs(scanner): clarify checkpoint persistence guarantees Distinguish a confirmed periodic save from validated restart coverage. Keep adoption and subtree-skip requirements explicit. Co-Authored-By: heihutu <heihutu@gmail.com> Co-Authored-By: zhi22915 <qiuzgang@gmail.com> * fix(scanner): preserve resumable periodic coverage Materialize active ancestor accounting in bounded periodic snapshots and seal completed coverage independently of raw enumeration state. Preserve durable coverage during early resumed enumeration and exclude unfinished out-of-order heal work from periodic and cancellation receipts. Reuse ancestor frame slots to avoid growing child-set copies on descent, retain compacted accumulator safety, and report checkpoint adoption resets. Co-Authored-By: heihutu <heihutu@gmail.com> Co-Authored-By: zhi22915 <qiuzgang@gmail.com> * fix(scanner): reject covered active ancestors in checkpoints Check every suspended ancestor alongside the current folder before certifying completed coverage. An unfinished covered ancestor must not become a resumable subtree merely because its descendant sorts later. Co-Authored-By: heihutu <heihutu@gmail.com> Co-Authored-By: zhi22915 <qiuzgang@gmail.com> * fix(scanner): retain an incomplete root for missing namespaces Create the empty bucket root explicitly at the missing-namespace boundary. Preserve nonempty durable caches and keep namespace results unpublished. Co-Authored-By: heihutu <heihutu@gmail.com> Co-Authored-By: zhi22915 <qiuzgang@gmail.com> --------- Co-authored-by: heihutu <heihutu@gmail.com> Co-authored-by: zhi22915 <qiuzgang@gmail.com>