fix: bump peerclaw-core to v0.6.2 for MessageTypeNotification

CI failed because peerclaw-core v0.6.1 does not include the
MessageTypeNotification constant used in signaling client.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: gcmsg

go.mod

@@ -8,7 +8,7 @@ require (
 	github.com/coder/websocket v1.8.14
 	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.4.0
 	github.com/google/uuid v1.6.0
-	github.com/peerclaw/peerclaw-core v0.6.1
+	github.com/peerclaw/peerclaw-core v0.6.2
 	github.com/pion/webrtc/v4 v4.1.2
 	golang.org/x/crypto v0.48.0
 )

go.sum

@@ -36,6 +36,8 @@ github.com/peerclaw/peerclaw-core v0.6.0 h1:2Ng1dRgKo+Kg1/R9ybAWrIxX/Otc3veemQe3
 github.com/peerclaw/peerclaw-core v0.6.0/go.mod h1:nlxhZV5ClCDDAh11ubrTLFluae1fK7bLj3uyUk/Gc4A=
 github.com/peerclaw/peerclaw-core v0.6.1 h1:xacM1gXa0ypFC31nNCvqY+9dr2s4xxQb/mWhybMIgP8=
 github.com/peerclaw/peerclaw-core v0.6.1/go.mod h1:nlxhZV5ClCDDAh11ubrTLFluae1fK7bLj3uyUk/Gc4A=
+github.com/peerclaw/peerclaw-core v0.6.2 h1:NIxTcOisypXJ+CYJunCIUkKHpFcP9QeJrMbqn+sokuU=
+github.com/peerclaw/peerclaw-core v0.6.2/go.mod h1:nlxhZV5ClCDDAh11ubrTLFluae1fK7bLj3uyUk/Gc4A=
 github.com/pion/datachannel v1.5.10 h1:ly0Q26K1i6ZkGf42W7D4hQYR90pZwzFOjTq5AuCKk4o=
 github.com/pion/datachannel v1.5.10/go.mod h1:p/jJfC9arb29W7WrxyKbepTU20CFgyx5oLo8Rs4Py/M=
 github.com/pion/dtls/v3 v3.0.6 h1:7Hkd8WhAJNbRgq9RgdNh1aaWlZlGpYTzdqjy9x9sK2E=