More Reliable MQTT and Redis Subscriptions

Fixed

• Ensure MQTT and Redis subscriptions are acknowledged by the broker before subscribe() resolves, preventing messages from being published before a subscription is ready.
• Prevent event listener leaks when subscribing to many MQTT or Redis channels.
• Preserve support for multiple handlers on the same channel while using a single transport-level message listener.
• Remove stale handlers when unsubscribing, preventing previous callbacks from running after resubscription.
• Gracefully ignore malformed or undecodable transport messages instead of throwing.

Maintenance

• Updated dependencies and test infrastructure.
• Added an automated release workflow.