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>

src/channels/registry.ts

@@ -8,6 +8,7 @@ export const CHAT_CHANNEL_ORDER = [
   "telegram",
   "whatsapp",
   "discord",
+  "irc",
   "googlechat",
   "slack",
   "signal",
@@ -58,6 +59,16 @@ const CHAT_CHANNEL_META: Record<ChatChannelId, ChannelMeta> = {
     blurb: "very well supported right now.",
     systemImage: "bubble.left.and.bubble.right",
   },
+  irc: {
+    id: "irc",
+    label: "IRC",
+    selectionLabel: "IRC (Server + Nick)",
+    detailLabel: "IRC",
+    docsPath: "/channels/irc",
+    docsLabel: "irc",
+    blurb: "classic IRC networks with DM/channel routing and pairing controls.",
+    systemImage: "network",
+  },
   googlechat: {
     id: "googlechat",
     label: "Google Chat",
@@ -102,6 +113,7 @@ const CHAT_CHANNEL_META: Record<ChatChannelId, ChannelMeta> = {
 
 export const CHAT_CHANNEL_ALIASES: Record<string, ChatChannelId> = {
   imsg: "imessage",
+  "internet-relay-chat": "irc",
   "google-chat": "googlechat",
   gchat: "googlechat",
 };