fix(envs): read reward and done from the step envelope in typed clients - #1017

Bugbot Analysis Progress (3m 9s elapsed)

✅ Gathered PR context (10s)
✅ Completed bug detection (2m 56s)
✅ Posted analysis results (3s)

Final Result: Bugbot completed review - no new issues found. 1 previously reported issue remain unresolved.

Request ID: serverGenReqId_0f77d983-1633-44ee-a358-1b3a86f46783