FEAT: Basic P2P Node Discovery

[iberi22]

Context

Synapse is a P2P protocol. The MVP needs to demonstrate devices finding each other.

Task

Implement a basic discovery mechanism.

Requirements

• Use mdns or libp2p-mdns for local network discovery.
• Show "Active Peers" count in the UI (Generative Dashboard).
• (Optional) Exchange a simple "Hello" message between nodes.

Reference

• crates/synapse-infra/src/network/

[google-labs-jules]

Jules is on it. When finished, you will see another comment and be able to review a PR.

[google-labs-jules]

Ready for a review! A PR has been created.

[google-labs-jules]

I apologize, but I encountered an unexpected error and wasn't able to complete the task.

[iberi22]

Actualizacion 2026-03-03: PR #705 fue cerrado por no-mergeable (dirty/conflictos y checks fallando). Se mantiene este issue abierto para reimplementacion/rebase limpia sobre main.

[iberi22]

Actualización de dependencia: este issue queda alineado como paso previo al sync completo de red (#679). Se mantiene bloqueado hasta definir alcance mínimo de discovery + handshake para MVP.