fix(consensus): prevent stuck consensus at height 173

Two fixes for consensus getting stuck:

1. Add Tendermint topics to default gossip subscriptions
   - Nodes now subscribe to all 5 Tendermint topics at startup
   - Prevents restarted nodes from missing consensus messages

2. Cache and replay future height proposals
   - Store proposals for height H+1 while at height H
   - Replay stored proposals when transitioning to new height
   - Add verify_future_height_proposal() validation function

This addresses the root causes identified in chaos test TM-B5
where the network got stuck at height 173.

Author: michaelgpt