feat: IRC — add first-class channel support

Adds IRC as a first-class channel with core config surfaces (schema/hints/dock), plugin auto-enable detection, routing/policy alignment, and docs/tests.

Co-authored-by: Vignesh <vigneshnatarajan92@gmail.com>

extensions/irc/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "@openclaw/irc",
+  "version": "2026.2.9",
+  "description": "OpenClaw IRC channel plugin",
+  "type": "module",
+  "devDependencies": {
+    "openclaw": "workspace:*"
+  },
+  "openclaw": {
+    "extensions": [
+      "./index.ts"
+    ]
+  }
+}