CI flake: Keynote Bench

[clockwork-labs-bot]

Detected by CI Gremlin after a failed GitHub Actions attempt succeeded on rerun.

Tests:

• Keynote Bench

Error:
Error: keynote benchmark throughput for TypeScript module is below threshold
2026-06-15T18:10:57.9502073Z

Failed job runs:

• https://github.com/clockworklabs/SpacetimeDB/actions/runs/27565374331/job/81490130339 (Keynote Bench, attempt 1 -> 2)

Context:

• none