- feat: cross-user file access returns not-found instead of
permission-denied
- fix: repository delete now only affects active rows and returns
ErrNotFound when no row changes; repeated deletes yield not-found
- feat: parent directory operations (list, upload, create-dir, move)
conceal ownership of other user's directories
- test: update handler, service, repository, and integration tests to
assert not-found behavior for cross-user and missing file operations
ld
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