The per-event body cap searched each streamed chunk in isolation, so an
event terminator split across two chunks was never seen: the finished
event's bytes were charged to the next event and the cap tripped early
on ordinary TCP fragmentation. A last-boundary rfind also lumped
multiple completed events in one chunk into a single charge, and the
separator tuple missed spec-legal CR and mixed line-ending styles.
Scan the carried suffix plus each new chunk with a terminator-pair
regex, walking every boundary left to right so each completed event is
charged once. The lookahead keeps a lone CRLF line ending from parsing
as a boundary, so multi-line events cannot evade the cap.
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