LimitRequestBodyMiddleware (pure ASGI, registered outermost) rejects request
bodies larger than PIRATS_MAX_BODY_BYTES (default 1 MiB) before they're buffered
into memory: it checks the declared Content-Length first, then counts the bytes
actually streamed so a chunked/length-omitting client can't bypass the header
check. Exposed as services.pirats.maxBodyBytes and documented in the README.
Tested in isolation (Content-Length fast path + streamed path) and through the
real app.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>