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/src/config-schema.test.ts

@@ -0,0 +1,27 @@
+import { describe, expect, it } from "vitest";
+import { IrcConfigSchema } from "./config-schema.js";
+
+describe("irc config schema", () => {
+  it("accepts numeric allowFrom and groupAllowFrom entries", () => {
+    const parsed = IrcConfigSchema.parse({
+      dmPolicy: "allowlist",
+      allowFrom: [12345, "alice"],
+      groupAllowFrom: [67890, "alice!ident@example.org"],
+    });
+
+    expect(parsed.allowFrom).toEqual([12345, "alice"]);
+    expect(parsed.groupAllowFrom).toEqual([67890, "alice!ident@example.org"]);
+  });
+
+  it("accepts numeric per-channel allowFrom entries", () => {
+    const parsed = IrcConfigSchema.parse({
+      groups: {
+        "#ops": {
+          allowFrom: [42, "alice"],
+        },
+      },
+    });
+
+    expect(parsed.groups?.["#ops"]?.allowFrom).toEqual([42, "alice"]);
+  });
+});