fix: persist next_idx over checkpoint for LogMemoryStore#9309
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fix: persist next_idx over checkpoint for LogMemoryStore#9309
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This PR ensures canister log record unique
idxis preserved over checkpoint and other lifecycle events.Previously the
next_idxwas stored insideLogMemoryStore::maybe_page_map, and reset to zero whenever the underlying page_map was dropped. This PR introduced apersisten_next_idxfield in LogMemoryStore that persists independently of that page_map, acting as a high-water mark. This guarantees index continuity even if the caniser is uninstalled and re-installed.