- read_image converts only AttachmentError rejections from saveImage;
any other value is a store defect or cancellation and propagates
unchanged instead of becoming IMAGE_STORE_FAILED.
- ImageInputError is no longer exported from the dsh-tool-fs entry, and
its JSDoc notes that two codes share AttachmentError spellings.
- str_replace_editor create maps a guarded-creation collision
(FS_NOT_OBSERVED after a concurrent create) to FS_ALREADY_EXISTS.
- The fs-local directory-swap test asserts FS_NOT_REGULAR_FILE exactly.
- The attachment upgrade guide lists the full AttachmentErrorCode set
instead of an ATTACHMENT_ prefix.
- dsh-error dependency entries sit in sorted position.
sjw1231
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