Variable: CHECKSUM_ATTACHMENT_KEYS
const CHECKSUM_ATTACHMENT_KEYS: readonly string[];
Defined in: packages/core/src/submission/submission.ts:142
Attachment properties covered by the checksum (docs/09 §13). localUri,
remoteId and status are deliberately absent: they are device-local
bookkeeping that changes as the file uploads, while the file's identity
(sha256) does not.