#3673 test: Measure performance of writing Singer stream to stdout Pull request opened by edgarrmondragon on <!date^1781129981^{date_short}|2026-06-10T22:19:41Z> We currently measure the performance of formatting a message for stdout, but we don't measure the cost of writing individual messages. Summary by Sourcery Measure the performance cost of writing Singer messages to stdout. Enhancements: • Add benchmarks for measuring stdout write throughput across simple and msgspec Singer writers, including individual record messages and realistic schema-record-state sequences. Tests: • Extend IO benchmark coverage to include actual message writing and flushing costs. meltano/sdk