Summary Replace individual .mpk (MessagePack) files under $STORE/index/ with a single SQLite database at $STORE/index.db using Node.js 22's built-in node:sqlite module. This reduces filesystem syscall overhead and improves space efficiency for small metadata entries. Closes #10826 Design New package: @pnpm/store.index A new StoreIndex class wraps a SQLite database with a simple key-value API (get,

