0.4.0

• feat: Add handle_with_protocols() for Sec-WebSocket-Protocol negotiation #479
• feat: Add optional typed message codecs with serde_json support.
• feat: Implement Sink<Message> for Session
• fix: Ignore empty continuation chunks #660
• fix: Truncate oversized control-frame payloads to avoid emitting invalid frames #508
• fix: Fix continuation overflow handling
• fix: Ensure MessageStream terminates on abrupt disconnects even if payload stalls (e.g. wss) #672