bench(results): add the sqs run to the results document

[zannis]

Summary

Measure SQS against LocalStack on the same host as the other published runs, with both SQS deviations in place (the 60,000-message drain corpus from #163 and the 100-per-worker FIFO corpus from #173) and the SNS byte-limit fix from #171, so the 64 KiB batch publishes go through. 60 rows, no failures, consumer_group and broadcast recorded as unsupported per the capability traits. The document now holds every backend, and the README and performance page say what the SQS rows measure: LocalStack at a recorded corpus, not the AWS service.

The charts are regenerated with the chartgen from #176: with six backends the parallel-vs-sequenced 64 KiB pair's caption runs two lines over the base budget, so those two SVGs grow to 672 px; the other twenty render at the base height.

Also carries the codex follow-up to #176 that missed its merge: the canvas-growth test now asserts the plot minimum from the y-axis polyline rather than from tick labels at 0.8 of the minimum.

What the run shows

• publish_batch at 64 KiB now succeeds (352 msg/s) where it failed the service's 256 KiB call limit before.
• consume_batch with the 10-message cap runs 2.3k to 3.3k msg/s on the drain, above supervisor's 1.9k to 2.8k at the same payload and consumer count.
• The FIFO cells ran in seconds at 100 per worker. At 40,000 messages the same cells crawled at 2.6 msg/s for hours, so LocalStack's FIFO path degrades sharply with backlog depth.
• Every offered-load rung was "not sustained": LocalStack tops out around a few hundred to a few thousand msg/s, well under the 5k rung, so the SQS dispatch-latency figures are queue residency and the charts mark them accordingly.

Verification

scripts/bench.sh charts regenerated the SVGs and the chartgen byte-compare suite passes (128 tests). Every non-SQS run in the document is the same data as main's, re-serialised by the harness. Codex review skipped for the results and generated SVGs; the test commit was reviewed in #176's round.

[zannis]

Draft until the chartgen caption budget is fixed: with six backends and two SQS deviation notes the parallel-vs-sequenced family's caption overflows its budget, so the SVGs on this branch are not yet regenerated from the document.

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