SDK v0.4.0 — AI-native agentic play
Adds provider-neutral agentic play as a first-class SDK capability:
- deterministic TypeScript AgentEnvironment
- concrete legal actions and action validation
- Gym-style termination and truncation
- rewards, metrics, transcripts, and batch evaluation
- portable observe/act/reset/transcript tool definitions
- Python episode and batch runners
- ArenaEnv action schemas and concrete parameterized actions
Products continue to own content, reducers, rewards, hosted policy, authentication, and leaderboards.