Add Decision 2.0 models to the Gateway registry

fix(space): align SystemOne question validation

fix(space): align SystemOne edge cases across gateway and studio

refactor(decision): use direct serving mode without legacy aliases

docs(decision): use deployment-neutral API URLs

docs(decision): show single and batch SystemOne calls

api(decision): move shared-question batches under systemone

Keep model discovery available without release-date metadata

Harden Decision model metadata and Cloud race budgets

Require explicit Decision model in direct Studio mode

Preserve independent Tetris playback and fair call timing

feat(studio): route strict Decision APIs to private drun instances

feat(decision): add strict public API and streamed Tetris races

Support large SystemOne batches and release completed task capacity

Default to Lux in descending model order and expose SDK-compatible SystemOne calls