v0.2.0

minip2p v0.2.0

Consolidated varint-length-prefixed framing in minip2p-core, reducing duplicated protocol codec code.
Simplified direct-address selection around select_direct_addrs.
Moved reusable multiaddr and stream-event predicates onto their owning types.
Tightened entropy handling:
- Ping generation now fails explicitly when OS randomness is unavailable.
- Custom circuit entropy sources can report backend failures through EntropyError::new.
Removed unused pre-1.0 APIs and test-only surface across the workspace.

See the documentation for installation and usage.