🧪 [testing improvement] Add test for std.redis module registration

[Tcode-Motion]

🎯 What:
Added a missing unit test for the register_redis function in stdlib/src/redis.rs.

📊 Coverage:
The new test covers:

1. Registration of the "std.redis" module in the StdlibRegistry.
2. Verification of the registered module's name, version, and the arity of its exported connect function.
3. Invocation of the connect callback, asserting it executes without error and correctly returns RuntimeValue::Str("Redis not yet available").

✨ Result:
Increased test coverage and robustness for standard library module registrations, establishing an automated regression safeguard for this component.

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PR created automatically by Jules for task 15999968237023246383 started by @Tcode-Motion

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