List ledger entries

The audit chain, oldest first, as a resumable stream. Because the ledger is append-only and ascending by seq, a stored page.nextCursor is a watermark: a request from it never returns an entry before it. Persist the last non-null nextCursor only after processing every entry in the responses read, and resume from it; the last page, which had no cursor of its own, is returned again, so de-duplicate on seq.

seq is monotonic within a workspace but not gap-free; continuity is proven by the hash chain, not by seq.