bench(results): add the rabbitmq and redis runs to the results document

[zannis]

Summary

Measure RabbitMQ and Redis on the pinned drain matrix, on the same host as the published in-process and Kafka runs, and regenerate every chart from the merged document. Both backends now carry a consume_batch series, and the README and performance page name the four measured backends.

• RabbitMQ: 145 rows, 3 failures. The batch drain ceiling sits 1.35 to 1.5x above consume_parallel at every payload. The failures are the 64 KiB drain at eight consumers, where the byte-capped 49 152-message corpus is mostly gone before the last worker is assigned; the in-process run already carries the same failure.
• Redis: 144 rows, 5 failures. The batch drain reaches 926k msg/s at 64 B against 453k for consumer_group. Three failures are the consume_fifo cells, which the matrix's --concurrent flag makes register_fifo reject on this backend; one is the purge of a six-million-entry stream timing out on DEL; one is a producer XADD timeout on the 64 KiB load ladder.

Known outliers left as measured

RabbitMQ consume_fifo at 64 B and Redis broadcast at four consumers came in well below their neighbours. Both were re-run in isolation and came back in line, but the harness merges whole runs, so they stay until the backend is measured again.

Not in the document

• NATS: the unpaced drain fill deadlocks. NatsPublisher::publish_batch fires every publish before awaiting any ack, and async-nats 0.49 defaults to blocking backpressure at 5 000 in-flight acks, so eight fill producers on one context wedge with no timeout. Reproduced deterministically at a 1M-message fill. Needs a publisher fix before the run.
• SQS: LocalStack was OOM-killed under the pinned six-million-message corpus. fix(bench): give sqs its own drain corpus instead of a 51-hour pass #163 has since given SQS its own corpus; the consume_fifo cells still run at about 2.6 msg/s on LocalStack.

Verification

scripts/bench.sh charts regenerated the SVGs and the chartgen byte-compare suite passes (119 tests).

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