Add track parameter validation hook#2144
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Tracks can already register custom param sources, runners, and schedulers, but there was no way to validate track parameters before a benchmark runs. This adds that missing hook.
register_validator(challenge_name, fn)so a track'sregister(registry)can register one or more validators for a challenge.TrackConfigErrorwhen they are invalid.BenchmarkCoordinator.setup(), after the track is loaded but before it provisions nodes or starts the benchmark, so bad parameters fail fast with a clear message.This change is additive and non-breaking. Tracks that do not register a validator behave exactly as before, since the hook is a no-op for them. No existing function signature changes in a way that affects current callers.
Closes #2143