/**
 * `readJournalLedgerIndex` is the read-only ledger surface the manifest
 * builder uses, and it takes a shortcut the ordinary journal read does not:
 * when the shard is a legacy JSON document it is scanned incrementally instead
 * of parsed whole.
 *
 * A shortcut in a read path earns exactly one kind of test — one that pins it
 * to the SAME answers the path it bypasses would have given, including the
 * uncomfortable ones. So these cover the recovery and normalisation behaviour
 * the streaming path could plausibly lose: last-good fallback, tombstone
 * exclusion, Windows key repair, and the difference between an absent ledger
 * and an unreadable one.
 */
export {};
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