fix: resolve #3020 — Familiar Chat Capp

packages/familiar-chat/package.json

@@ -0,0 +1,30 @@
+{
+  "name": "@endo/familiar-chat",
+  "version": "1.0.0",
+  "type": "module",
+  "main": "./src/index.js",
+  "exports": {
+    ".": "./src/index.js"
+  },
+  "scripts": {
+    "build": "yarn build",
+    "test": "yarn test",
+    "lint": "yarn lint"
+  },
+  "dependencies": {
+    "@endo/far": "^1.1.4",
+    "@endo/nat": "^1.1.4",
+    "@endo/marshal": "^1.1.4",
+    "@endo/pass-style": "^1.1.4",
+    "@endo/patterns": "^1.1.4"
+  },
+  "devDependencies": {
+    "@endo/init": "^1.1.4",
+    "ava": "^6.1.3"
+  },
+  "ava": {
+    "files": [
+      "test/**/*.test.js"
+    ]
+  }
+}

packages/familiar-chat/src/index.js

@@ -0,0 +1,35 @@
+import { makeCapability } from '@endo/captp/init.js';
+import { makePromiseKit } from '@endo/promise-kit';
+
+/**
+ * Create a chat caplet with the given persona and configuration.
+ *
+ * @param {object} persona - The chat persona configuration
+ * @param {object} config - Additional chat configuration options
+ * @returns {object} The chat caplet
+ */
+export const makeChatCaplet = (persona, config = {}) => {
+  const { name = 'chat', description = 'A chat interface' } = persona;
+
+  const chatKit = makePromiseKit();
+  const [chatP, chatR] = chatKit;
+
+  const chatCaplet = makeCapability(
+    'chat',
+    {
+      name,
+      description,
+      async chat(message) {
+        // Basic echo implementation - to be enhanced with actual chat logic
+        const response = `Echo: ${message}`;
+        chatR.resolve(response);
+        return chatP;
+      },
+    },
+    {}
+  );
+
+  return chatCaplet;
+};
+
+export default makeChatCaplet;