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Client attachment resource ownership: Orphan preview cleanup · case 04

Orphan preview cleanup.

Member previewVariant 4 · 3 implementations · 60 checks per implementation

Case contract

Attachment identity differs from file name and byte count. Zero-byte and same-name files remain separate. Preview URLs and selected IDs are cleaned by attachment identity; submitted files and read-only commands have separate lifetimes. Operation orphan-preview-cleanup has the six explicit input/output oracles below.

Why this case matters

An offline client lifecycle model that isolates a state-management defect without DOM rendering or network services.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
orphan-preview-cleanup scenario 1	`["blob:a", "blob:b"]`	`[]`	Failed

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