Add IRC MCP server for Claude Code

Connects to Rizon over TLS, answers PINGs, buffers recent channel
messages, and exposes join/leave/send/read/list-users tools limited to
channels in config.json. Never posts unprompted.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

config.json

@@ -0,0 +1,11 @@
+{
+  "server": "irc.rizon.net",
+  "port": 6697,
+  "tls": true,
+  "nick": "tpuahsiew_claude",
+  "fallback_nicks": ["tpuahsiew_claude_", "tpuahsiew_claude2"],
+  "username": "claude",
+  "realname": "Claude Code IRC MCP",
+  "allowed_channels": ["#blog"],
+  "buffer_size": 200
+}