Document dataset versions and select the expanded 550-task edition

#2

Restore the 430 → 550 release order. Publish v1.0.0 and v2.1.0 as immutable input editions, retain original definitions and scorer identities, and keep version/comparison rules in VERSIONING.md. This PR updates dataset main to the newer 550-task viewer. No provider measurements are included.

gehuageyan changed pull request status to merged

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