Replace 4,000 verbose top-level sample IDs with stepguard-rl-000001 through stepguard-rl-004000. Preserve row order and all other sample fields. Document the identifier format in the dataset card.
Rename dataset card to StepGuard-Data and update loading examples
Align the dataset card with the StepGuard model release, document verified schemas and composition, add loading examples and citation, and replace outdated private-release wording.
