fix(sdk): close replaced stream iterators

[BobbyAxerol]

Summary

Type

• Data contract / API
• Provider integration
• Streaming / Redis
• VN preload / storage
• Diagnostics / monitoring
• Docs / repo hygiene

Checks

• I did not commit directly to main.
• Docs are updated for public behavior changes.
• Tests are added or updated.
• Docker tests pass, or a blocker is documented.
• No secrets, generated logs, parquet data, or local caches are included.

Test Evidence