When a record exceeds the configured max_line_size, discard just that record
and continue reading the rest of the segment instead of aborting the entire
segment.
The zstd decompression buffer now grows on demand to read records up to
a configurable 128 MiB cap. Oversized records are rejected explicitly
both on read and write, with matching limits so all written records are
guaranteed readable.
Wez Furlong