A host started a thread for every request a guest sent, so a guest could make
it start as many as it liked. Each guest now has two workers and room for 30
requests waiting; it may start 100 requests a second, 200 at once, besides a
read's later chunks and an upload's. A guest past either limit hears Bye
"flooded" and is hung up on, and a peer's Bye now ends its connection at
once rather than after its silence.

Assisted-by: claude-opus-5.5