Add AgentBBS connector plugin (#131)

Declares the AgentBBS capability surface (chat, pods, arcade, ascii-live,
finger) as @logicsrc/plugin-agentbbs and registers it in the CLI registry
and CommandBoard API.

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

plugins/agentbbs/src/index.test.ts

@@ -0,0 +1,11 @@
+import { describe, expect, it } from "vitest";
+import { createPluginRegistry } from "@logicsrc/plugin-core";
+import { agentBbsPlugin } from "./index.js";
+
+describe("agentbbs plugin", () => {
+  it("registers with a valid manifest", () => {
+    const registry = createPluginRegistry([agentBbsPlugin]);
+    expect(registry.get("agentbbs")?.enabled).toBe(true);
+    expect(registry.snapshot().capabilities["pods.provision"]).toEqual(["agentbbs"]);
+  });
+});