1. Fixed Reshare Deadlocks

• Problem: Sessions hung when adding/removing nodes because old committee members weren't "listening" to messages from new nodes.
• Fix: Updated event_consumer.go to ensure old committee members subscribe to all peers in the new committee, enabling full bi-directional communication.

2. Alternating ECDSA Pre-parameters

• Problem: New nodes were hardcoded to use preParams[1], causing reuse across multiple reshare events.
• Fix: Dynamic selection using version % 2. Joining nodes now alternate between pre-params [0] and [1] every time the key version increases, improving cryptographic security.