Building a benchmark regression suite

The two fixes are in, but how do you stop them from silently breaking as the space keeps changing? Spot-checking in chat catches today's problem; leadership wants ongoing confidence.

A benchmark suite turns one-off checks into a repeatable regression test: fixed questions paired with known-correct SQL that you can re-run after any change. Build the suite now; that's the durable safeguard before a full-floor rollout. The Benchmark tab starts empty - that's expected, since you'll build the suite from scratch.

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